{
"lighthouseVersion": "13.5.0",
"requestedUrl": "http://localhost:8080/",
"mainDocumentUrl": "http://localhost:8080/",
"finalDisplayedUrl": "http://localhost:8080/",
"finalUrl": "http://localhost:8080/",
"fetchTime": "2026-10-15T16:59:16.699Z",
"gatherMode": "navigation",
"runWarnings": [],
"userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/151.0.0.0 Safari/537.36",
"environment": {
"networkUserAgent": "Mozilla/5.0 (Linux; Android 11; moto g power (2022)) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Mobile Safari/537.36",
"hostUserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/151.0.0.0 Safari/537.36",
"benchmarkIndex": 4605.5,
"credits": {}
},
"audits": {
"first-contentful-paint": {
"id": "first-contentful-paint",
"title": "First Contentful Paint",
"description": "First Contentful Paint marks the time at which the first text or image is painted. [Learn more about the First Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/first-contentful-paint/).",
"score": 0.79,
"scoreDisplayMode": "numeric",
"numericValue": 2152.1841,
"numericUnit": "millisecond",
"displayValue": "2.2 s",
"scoringOptions": {
"p10": 1800,
"median": 3000
}
},
"largest-contentful-paint": {
"id": "largest-contentful-paint",
"title": "Largest Contentful Paint",
"description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)",
"score": 0,
"scoreDisplayMode": "numeric",
"numericValue": 47701.1841,
"numericUnit": "millisecond",
"displayValue": "47.7 s",
"scoringOptions": {
"p10": 2500,
"median": 4000
}
},
"speed-index": {
"id": "speed-index",
"title": "Speed Index",
"description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).",
"score": 0.8,
"scoreDisplayMode": "numeric",
"numericValue": 4028.0950401655573,
"numericUnit": "millisecond",
"displayValue": "4.0 s",
"scoringOptions": {
"p10": 3387,
"median": 5800
}
},
"total-blocking-time": {
"id": "total-blocking-time",
"title": "Total Blocking Time",
"description": "Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. [Learn more about the Total Blocking Time metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-total-blocking-time/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 0,
"numericUnit": "millisecond",
"displayValue": "0 ms",
"scoringOptions": {
"p10": 200,
"median": 600
}
},
"max-potential-fid": {
"id": "max-potential-fid",
"title": "Max Potential First Input Delay",
"description": "The maximum potential First Input Delay that your users could experience is the duration of the longest task. [Learn more about the Maximum Potential First Input Delay metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-max-potential-fid/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 16,
"numericUnit": "millisecond",
"displayValue": "20 ms"
},
"cumulative-layout-shift": {
"id": "cumulative-layout-shift",
"title": "Cumulative Layout Shift",
"description": "Cumulative Layout Shift measures the movement of visible elements within the viewport. [Learn more about the Cumulative Layout Shift metric](https://web.dev/articles/cls).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 0,
"numericUnit": "unitless",
"displayValue": "0",
"scoringOptions": {
"p10": 0.1,
"median": 0.25
},
"details": {
"type": "debugdata",
"items": [
{
"cumulativeLayoutShiftMainFrame": 0,
"newEngineResult": {
"cumulativeLayoutShift": 0,
"cumulativeLayoutShiftMainFrame": 0
},
"newEngineResultDiffered": false
}
]
}
},
"server-response-time": {
"id": "server-response-time",
"title": "Initial server response time was short",
"description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more about the Time to First Byte metric](https://developer.chrome.com/docs/lighthouse/performance/time-to-first-byte/).",
"score": 1,
"scoreDisplayMode": "metricSavings",
"numericValue": 1,
"numericUnit": "millisecond",
"displayValue": "Root document took 0 ms",
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "opportunity",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "responseTime",
"valueType": "timespanMs",
"label": "Time Spent"
}
],
"items": [
{
"url": "http://localhost:8080/",
"responseTime": 1
}
],
"overallSavingsMs": 0
},
"guidanceLevel": 1
},
"interactive": {
"id": "interactive",
"title": "Time to Interactive",
"description": "Time to Interactive is the amount of time it takes for the page to become fully interactive. [Learn more about the Time to Interactive metric](https://developer.chrome.com/docs/lighthouse/performance/interactive/).",
"score": 0,
"scoreDisplayMode": "numeric",
"numericValue": 47701.1841,
"numericUnit": "millisecond",
"displayValue": "47.7 s"
},
"user-timings": {
"id": "user-timings",
"title": "User Timing marks and measures",
"description": "Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences. [Learn more about User Timing marks](https://developer.chrome.com/docs/lighthouse/performance/user-timings/).",
"score": null,
"scoreDisplayMode": "notApplicable",
"details": {
"type": "table",
"headings": [
{
"key": "name",
"valueType": "text",
"label": "Name"
},
{
"key": "timingType",
"valueType": "text",
"label": "Type"
},
{
"key": "startTime",
"valueType": "ms",
"granularity": 0.01,
"label": "Start Time"
},
{
"key": "duration",
"valueType": "ms",
"granularity": 0.01,
"label": "Duration"
}
],
"items": []
},
"guidanceLevel": 2
},
"redirects": {
"id": "redirects",
"title": "Avoid multiple page redirects",
"description": "Redirects introduce additional delays before the page can be loaded. [Learn how to avoid page redirects](https://developer.chrome.com/docs/lighthouse/performance/redirects/).",
"score": 1,
"scoreDisplayMode": "metricSavings",
"numericValue": 0,
"numericUnit": "millisecond",
"displayValue": "",
"metricSavings": {
"LCP": 0,
"FCP": 0
},
"details": {
"type": "opportunity",
"headings": [],
"items": [],
"overallSavingsMs": 0
},
"guidanceLevel": 2
},
"mainthread-work-breakdown": {
"id": "mainthread-work-breakdown",
"title": "Minimizes main-thread work",
"description": "Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. [Learn how to minimize main-thread work](https://developer.chrome.com/docs/lighthouse/performance/mainthread-work-breakdown/)",
"score": 1,
"scoreDisplayMode": "metricSavings",
"numericValue": 1493.9199999999978,
"numericUnit": "millisecond",
"displayValue": "1.5 s",
"metricSavings": {
"TBT": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "groupLabel",
"valueType": "text",
"label": "Category"
},
{
"key": "duration",
"valueType": "ms",
"granularity": 1,
"label": "Time Spent"
}
],
"items": [
{
"group": "scriptEvaluation",
"groupLabel": "Script Evaluation",
"duration": 1409.5359999999976
},
{
"group": "other",
"groupLabel": "Other",
"duration": 61.28800000000013
},
{
"group": "styleLayout",
"groupLabel": "Style & Layout",
"duration": 10.732
},
{
"group": "paintCompositeRender",
"groupLabel": "Rendering",
"duration": 7.683999999999999
},
{
"group": "garbageCollection",
"groupLabel": "Garbage Collection",
"duration": 3.0600000000000014
},
{
"group": "parseHTML",
"groupLabel": "Parse HTML & CSS",
"duration": 0.9
},
{
"group": "scriptParseCompile",
"groupLabel": "Script Parsing & Compilation",
"duration": 0.7200000000000001
}
],
"sortedBy": [
"duration"
]
},
"guidanceLevel": 1
},
"bootup-time": {
"id": "bootup-time",
"title": "Reduce JavaScript execution time",
"description": "Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. [Learn how to reduce Javascript execution time](https://developer.chrome.com/docs/lighthouse/performance/bootup-time/).",
"score": 0.5,
"scoreDisplayMode": "metricSavings",
"numericValue": 1402.2959999999987,
"numericUnit": "millisecond",
"displayValue": "1.4 s",
"metricSavings": {
"TBT": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "total",
"granularity": 1,
"valueType": "ms",
"label": "Total CPU Time"
},
{
"key": "scripting",
"granularity": 1,
"valueType": "ms",
"label": "Script Evaluation"
},
{
"key": "scriptParseCompile",
"granularity": 1,
"valueType": "ms",
"label": "Script Parse"
}
],
"items": [
{
"url": "http://localhost:8080/app.js",
"total": 1400.6359999999986,
"scripting": 1397.1199999999985,
"scriptParseCompile": 0.16
},
{
"url": "Unattributable",
"total": 58.78400000000011,
"scripting": 5.015999999999999,
"scriptParseCompile": 0
}
],
"summary": {
"wastedMs": 1402.2959999999987
},
"sortedBy": [
"total"
]
},
"guidanceLevel": 1
},
"diagnostics": {
"id": "diagnostics",
"title": "Diagnostics",
"description": "Collection of useful page vitals.",
"score": 1,
"scoreDisplayMode": "informative",
"details": {
"type": "debugdata",
"items": [
{
"numRequests": 4,
"numScripts": 1,
"numStylesheets": 0,
"numFonts": 0,
"numTasks": 420,
"numTasksOver10ms": 1,
"numTasksOver25ms": 1,
"numTasksOver50ms": 1,
"numTasksOver100ms": 1,
"numTasksOver500ms": 0,
"rtt": 0.013949999999999999,
"throughput": 209518152.58076903,
"maxRtt": 0.013949999999999999,
"maxServerLatency": 0.59205,
"totalByteWeight": 9536503,
"totalTaskTime": 373.4799999999953,
"mainDocumentTransferSize": 825
}
]
}
},
"network-requests": {
"id": "network-requests",
"title": "Network Requests",
"description": "Lists the network requests that were made during page load.",
"score": 1,
"scoreDisplayMode": "informative",
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "protocol",
"valueType": "text",
"label": "Protocol"
},
{
"key": "networkRequestTime",
"valueType": "ms",
"granularity": 1,
"label": "Network Request Time"
},
{
"key": "networkEndTime",
"valueType": "ms",
"granularity": 1,
"label": "Network End Time"
},
{
"key": "transferSize",
"valueType": "bytes",
"displayUnit": "kb",
"granularity": 1,
"label": "Transfer Size"
},
{
"key": "resourceSize",
"valueType": "bytes",
"displayUnit": "kb",
"granularity": 1,
"label": "Resource Size"
},
{
"key": "statusCode",
"valueType": "text",
"label": "Status Code"
},
{
"key": "mimeType",
"valueType": "text",
"label": "MIME Type"
},
{
"key": "resourceType",
"valueType": "text",
"label": "Resource Type"
}
],
"items": [
{
"url": "http://localhost:8080/",
"sessionTargetType": "page",
"protocol": "http/1.0",
"cache": "none",
"rendererStartTime": 0,
"networkRequestTime": 0.3339996337890625,
"networkEndTime": 1.8889994621276855,
"finished": true,
"transferSize": 825,
"resourceSize": 639,
"statusCode": 200,
"mimeType": "text/html",
"resourceType": "Document",
"priority": "VeryHigh",
"experimentalFromMainFrame": true,
"entity": "localhost"
},
{
"url": "http://localhost:8080/app.js",
"sessionTargetType": "page",
"protocol": "http/1.0",
"cache": "none",
"rendererStartTime": 26.5939998626709,
"networkRequestTime": 28.232999324798584,
"networkEndTime": 29.079999446868896,
"finished": true,
"transferSize": 362,
"resourceSize": 170,
"statusCode": 200,
"mimeType": "text/javascript",
"resourceType": "Script",
"priority": "High",
"experimentalFromMainFrame": true,
"entity": "localhost"
},
{
"url": "http://localhost:8080/hero.png",
"sessionTargetType": "page",
"protocol": "http/1.0",
"cache": "none",
"rendererStartTime": 26.69499969482422,
"networkRequestTime": 28.356999397277832,
"networkEndTime": 393.01699924468994,
"finished": true,
"transferSize": 9534796,
"resourceSize": 9534606,
"statusCode": 200,
"mimeType": "image/png",
"resourceType": "Image",
"priority": "Medium",
"experimentalFromMainFrame": true,
"entity": "localhost"
},
{
"url": "http://localhost:8080/favicon.ico",
"sessionTargetType": "page",
"protocol": "http/1.0",
"cache": "none",
"rendererStartTime": 397.11699962615967,
"networkRequestTime": 397.24799966812134,
"networkEndTime": 397.949999332428,
"finished": true,
"transferSize": 520,
"resourceSize": 335,
"statusCode": 404,
"mimeType": "text/html",
"resourceType": "Other",
"priority": "High",
"experimentalFromMainFrame": true,
"entity": "localhost"
}
],
"debugData": {
"type": "debugdata",
"networkStartTimeTs": 2373666334784.0005,
"initiators": [
{
"type": "parser",
"url": "http://localhost:8080/",
"lineNumber": 7,
"columnNumber": 21
},
{
"type": "parser",
"url": "http://localhost:8080/",
"lineNumber": 12,
"columnNumber": 49
}
]
}
}
},
"network-rtt": {
"id": "network-rtt",
"title": "Network Round Trip Times",
"description": "Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance. [Learn more about the Round Trip Time](https://hpbn.co/primer-on-latency-and-bandwidth/).",
"score": 1,
"scoreDisplayMode": "informative",
"numericValue": 0.013949999999999999,
"numericUnit": "millisecond",
"displayValue": "0 ms",
"details": {
"type": "table",
"headings": [
{
"key": "origin",
"valueType": "text",
"label": "URL"
},
{
"key": "rtt",
"valueType": "ms",
"granularity": 1,
"label": "Time Spent"
}
],
"items": [
{
"origin": "http://localhost:8080",
"rtt": 0.013949999999999999
}
],
"sortedBy": [
"rtt"
]
}
},
"network-server-latency": {
"id": "network-server-latency",
"title": "Server Backend Latencies",
"description": "Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance. [Learn more about server response time](https://hpbn.co/primer-on-web-performance/#analyzing-the-resource-waterfall).",
"score": 1,
"scoreDisplayMode": "informative",
"numericValue": 0.59205,
"numericUnit": "millisecond",
"displayValue": "0 ms",
"details": {
"type": "table",
"headings": [
{
"key": "origin",
"valueType": "text",
"label": "URL"
},
{
"key": "serverResponseTime",
"valueType": "ms",
"granularity": 1,
"label": "Time Spent"
}
],
"items": [
{
"origin": "http://localhost:8080",
"serverResponseTime": 0.59205
}
],
"sortedBy": [
"serverResponseTime"
]
}
},
"main-thread-tasks": {
"id": "main-thread-tasks",
"title": "Tasks",
"description": "Lists the toplevel main thread tasks that executed during page load.",
"score": 1,
"scoreDisplayMode": "informative",
"details": {
"type": "table",
"headings": [
{
"key": "startTime",
"valueType": "ms",
"granularity": 1,
"label": "Start Time"
},
{
"key": "duration",
"valueType": "ms",
"granularity": 1,
"label": "End Time"
}
],
"items": [
{
"duration": 350.159,
"startTime": 29.937
}
]
}
},
"metrics": {
"id": "metrics",
"title": "Metrics",
"description": "Collects all available metrics.",
"score": 1,
"scoreDisplayMode": "informative",
"numericValue": 47701,
"numericUnit": "millisecond",
"details": {
"type": "debugdata",
"items": [
{
"firstContentfulPaint": 2152,
"largestContentfulPaint": 47701,
"interactive": 47701,
"speedIndex": 4028,
"totalBlockingTime": 0,
"maxPotentialFID": 16,
"cumulativeLayoutShift": 0,
"cumulativeLayoutShiftMainFrame": 0,
"lcpLoadDelay": 604,
"lcpLoadDuration": 8260,
"timeToFirstByte": 451,
"observedTimeOrigin": 0,
"observedTimeOriginTs": 2373666334351,
"observedNavigationStart": 0,
"observedNavigationStartTs": 2373666334351,
"observedFirstPaint": 2272,
"observedFirstPaintTs": 2373668606562,
"observedFirstContentfulPaint": 2272,
"observedFirstContentfulPaintTs": 2373668606562,
"observedFirstContentfulPaintAllFrames": 2272,
"observedFirstContentfulPaintAllFramesTs": 2373668606562,
"observedLargestContentfulPaint": 2272,
"observedLargestContentfulPaintTs": 2373668606562,
"observedLargestContentfulPaintAllFrames": 2272,
"observedLargestContentfulPaintAllFramesTs": 2373668606562,
"observedTraceEnd": 4588,
"observedTraceEndTs": 2373670921956,
"observedLoad": 394,
"observedLoadTs": 2373666728801,
"observedDomContentLoaded": 381,
"observedDomContentLoadedTs": 2373666715226,
"observedCumulativeLayoutShift": 0,
"observedCumulativeLayoutShiftMainFrame": 0,
"observedFirstVisualChange": 2262,
"observedFirstVisualChangeTs": 2373668596351,
"observedLastVisualChange": 2262,
"observedLastVisualChangeTs": 2373668596351,
"observedSpeedIndex": 2262,
"observedSpeedIndexTs": 2373668596652
},
{
"lcpInvalidated": false
}
]
}
},
"resource-summary": {
"id": "resource-summary",
"title": "Resources Summary",
"description": "Aggregates all network requests and groups them by type",
"score": 1,
"scoreDisplayMode": "informative",
"details": {
"type": "table",
"headings": [
{
"key": "label",
"valueType": "text",
"label": "Resource Type"
},
{
"key": "requestCount",
"valueType": "numeric",
"label": "Requests"
},
{
"key": "transferSize",
"valueType": "bytes",
"label": "Transfer Size"
}
],
"items": [
{
"resourceType": "total",
"label": "Total",
"requestCount": 3,
"transferSize": 9535983
},
{
"resourceType": "image",
"label": "Image",
"requestCount": 1,
"transferSize": 9534796
},
{
"resourceType": "document",
"label": "Document",
"requestCount": 1,
"transferSize": 825
},
{
"resourceType": "script",
"label": "Script",
"requestCount": 1,
"transferSize": 362
},
{
"resourceType": "stylesheet",
"label": "Stylesheet",
"requestCount": 0,
"transferSize": 0
},
{
"resourceType": "media",
"label": "Media",
"requestCount": 0,
"transferSize": 0
},
{
"resourceType": "font",
"label": "Font",
"requestCount": 0,
"transferSize": 0
},
{
"resourceType": "other",
"label": "Other",
"requestCount": 0,
"transferSize": 0
},
{
"resourceType": "third-party",
"label": "Third-party",
"requestCount": 0,
"transferSize": 0
}
]
}
},
"layout-shifts": {
"id": "layout-shifts",
"title": "Avoid large layout shifts",
"description": "These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to [windowing](https://web.dev/articles/cls#what_is_cls). [Learn how to improve CLS](https://web.dev/articles/optimize-cls)",
"score": null,
"scoreDisplayMode": "notApplicable",
"metricSavings": {
"CLS": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "node",
"valueType": "node",
"subItemsHeading": {
"key": "extra"
},
"label": "Element"
},
{
"key": "score",
"valueType": "numeric",
"subItemsHeading": {
"key": "cause",
"valueType": "text"
},
"granularity": 0.001,
"label": "Layout shift score"
}
],
"items": []
},
"guidanceLevel": 2
},
"long-tasks": {
"id": "long-tasks",
"title": "Avoid long main-thread tasks",
"description": "Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay. [Learn how to avoid long main-thread tasks](https://web.dev/articles/optimize-long-tasks)",
"score": 1,
"scoreDisplayMode": "informative",
"displayValue": "1 long task found",
"metricSavings": {
"TBT": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "startTime",
"valueType": "ms",
"granularity": 1,
"label": "Start Time"
},
{
"key": "duration",
"valueType": "ms",
"granularity": 1,
"label": "Duration"
}
],
"items": [
{
"url": "http://localhost:8080/app.js",
"duration": 1401,
"startTime": 751.1841
}
],
"sortedBy": [
"duration"
],
"skipSumming": [
"startTime"
],
"debugData": {
"type": "debugdata",
"urls": [
"http://localhost:8080/app.js"
],
"tasks": [
{
"urlIndex": 0,
"startTime": 751.2,
"duration": 1401,
"other": 1401,
"scriptEvaluation": 0
}
]
}
},
"guidanceLevel": 1
},
"non-composited-animations": {
"id": "non-composited-animations",
"title": "Avoid non-composited animations",
"description": "Animations which are not composited can be janky and increase CLS. [Learn how to avoid non-composited animations](https://developer.chrome.com/docs/lighthouse/performance/non-composited-animations/)",
"score": null,
"scoreDisplayMode": "notApplicable",
"metricSavings": {
"CLS": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "node",
"valueType": "node",
"subItemsHeading": {
"key": "failureReason",
"valueType": "text"
},
"label": "Element"
}
],
"items": []
},
"guidanceLevel": 2
},
"unsized-images": {
"id": "unsized-images",
"title": "Image elements do not have explicit `width` and `height`",
"description": "Set an explicit width and height on image elements to reduce layout shifts and improve CLS. [Learn how to set image dimensions](https://web.dev/articles/optimize-cls#images_without_dimensions)",
"score": 0.5,
"scoreDisplayMode": "metricSavings",
"metricSavings": {
"CLS": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "node",
"valueType": "node",
"label": ""
},
{
"key": "url",
"valueType": "url",
"label": "URL"
}
],
"items": [
{
"url": "http://localhost:8080/hero.png",
"node": {
"type": "node",
"lhId": "1-0-IMG",
"path": "1,HTML,1,BODY,1,IMG",
"selector": "body > img",
"boundingRect": {
"top": 50,
"bottom": 290,
"left": 0,
"right": 412,
"width": 412,
"height": 240
},
"snippet": "![\"Mountain](\"hero.png\")
",
"nodeLabel": "Mountain trail at dawn"
}
}
]
},
"guidanceLevel": 4
},
"script-treemap-data": {
"id": "script-treemap-data",
"title": "Script Treemap Data",
"description": "Used for treemap app",
"score": 1,
"scoreDisplayMode": "informative",
"details": {
"type": "treemap-data",
"nodes": [
{
"name": "http://localhost:8080/app.js",
"resourceBytes": 170,
"encodedBytes": 170,
"unusedBytes": 0
}
]
}
},
"total-byte-weight": {
"id": "total-byte-weight",
"title": "Avoid enormous network payloads",
"description": "Large network payloads cost users real money and are highly correlated with long load times. [Learn how to reduce payload sizes](https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight/).",
"score": 0.5,
"scoreDisplayMode": "metricSavings",
"numericValue": 9536503,
"numericUnit": "byte",
"displayValue": "Total size was 9,313 KiB",
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "totalBytes",
"valueType": "bytes",
"label": "Transfer Size"
}
],
"items": [
{
"url": "http://localhost:8080/hero.png",
"totalBytes": 9534796
},
{
"url": "http://localhost:8080/",
"totalBytes": 825
},
{
"url": "http://localhost:8080/favicon.ico",
"totalBytes": 520
},
{
"url": "http://localhost:8080/app.js",
"totalBytes": 362
}
],
"sortedBy": [
"totalBytes"
]
},
"guidanceLevel": 1
},
"unminified-css": {
"id": "unminified-css",
"title": "Minify CSS",
"description": "Minifying CSS files can reduce network payload sizes. [Learn how to minify CSS](https://developer.chrome.com/docs/lighthouse/performance/unminified-css/).",
"score": 1,
"scoreDisplayMode": "metricSavings",
"numericValue": 0,
"numericUnit": "millisecond",
"displayValue": "",
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "opportunity",
"headings": [],
"items": [],
"overallSavingsMs": 0,
"overallSavingsBytes": 0,
"sortedBy": [
"wastedBytes"
],
"debugData": {
"type": "debugdata",
"metricSavings": {
"FCP": 0,
"LCP": 0
}
}
},
"guidanceLevel": 3
},
"unminified-javascript": {
"id": "unminified-javascript",
"title": "Minify JavaScript",
"description": "Minifying JavaScript files can reduce payload sizes and script parse time. [Learn how to minify JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unminified-javascript/).",
"score": 1,
"scoreDisplayMode": "metricSavings",
"numericValue": 0,
"numericUnit": "millisecond",
"displayValue": "",
"warnings": [],
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "opportunity",
"headings": [],
"items": [],
"overallSavingsMs": 0,
"overallSavingsBytes": 0,
"sortedBy": [
"wastedBytes"
],
"debugData": {
"type": "debugdata",
"metricSavings": {
"FCP": 0,
"LCP": 0
}
}
},
"guidanceLevel": 3
},
"unused-css-rules": {
"id": "unused-css-rules",
"title": "Reduce unused CSS",
"description": "Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. [Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).",
"score": 1,
"scoreDisplayMode": "metricSavings",
"numericValue": 0,
"numericUnit": "millisecond",
"displayValue": "",
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "opportunity",
"headings": [],
"items": [],
"overallSavingsMs": 0,
"overallSavingsBytes": 0,
"sortedBy": [
"wastedBytes"
],
"debugData": {
"type": "debugdata",
"metricSavings": {
"FCP": 0,
"LCP": 0
}
}
},
"guidanceLevel": 1
},
"unused-javascript": {
"id": "unused-javascript",
"title": "Reduce unused JavaScript",
"description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn how to reduce unused JavaScript](https://developer.chrome.com/docs/lighthouse/performance/unused-javascript/).",
"score": 1,
"scoreDisplayMode": "metricSavings",
"numericValue": 0,
"numericUnit": "millisecond",
"displayValue": "",
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "opportunity",
"headings": [],
"items": [],
"overallSavingsMs": 0,
"overallSavingsBytes": 0,
"sortedBy": [
"wastedBytes"
],
"debugData": {
"type": "debugdata",
"metricSavings": {
"FCP": 0,
"LCP": 0
}
}
},
"guidanceLevel": 1
},
"bf-cache": {
"id": "bf-cache",
"title": "Page didn't prevent back/forward cache restoration",
"description": "Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. [Learn more about the bfcache](https://developer.chrome.com/docs/lighthouse/performance/bf-cache/)",
"score": 1,
"scoreDisplayMode": "binary",
"guidanceLevel": 4
},
"cache-insight": {
"id": "cache-insight",
"title": "Use efficient cache lifetimes",
"description": "A long cache lifetime can speed up repeat visits to your page. [Learn more about caching](https://developer.chrome.com/docs/performance/insights/cache).",
"score": 0,
"scoreDisplayMode": "metricSavings",
"displayValue": "Est savings of 9,312 KiB",
"metricSavings": {
"FCP": 0,
"LCP": 45550
},
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "Request"
},
{
"key": "cacheLifetimeMs",
"valueType": "ms",
"label": "Cache TTL",
"displayUnit": "duration"
},
{
"key": "totalBytes",
"valueType": "bytes",
"label": "Transfer Size",
"displayUnit": "kb",
"granularity": 1
}
],
"items": [
{
"url": "http://localhost:8080/hero.png",
"cacheLifetimeMs": 0,
"totalBytes": 9534796,
"wastedBytes": 9534796
},
{
"url": "http://localhost:8080/app.js",
"cacheLifetimeMs": 0,
"totalBytes": 362,
"wastedBytes": 362
}
],
"sortedBy": [
"wastedBytes"
],
"skipSumming": [
"cacheLifetimeMs"
],
"debugData": {
"type": "debugdata",
"wastedBytes": 9535158
}
},
"guidanceLevel": 3
},
"cls-culprits-insight": {
"id": "cls-culprits-insight",
"title": "Layout shift culprits",
"description": "Layout shifts occur when elements move absent any user interaction. [Investigate the causes of layout shifts](https://developer.chrome.com/docs/performance/insights/cls-culprit), such as elements being added, removed, or their fonts changing as the page loads.",
"score": 1,
"scoreDisplayMode": "numeric",
"metricSavings": {
"CLS": 0
},
"details": {
"type": "list",
"items": []
},
"guidanceLevel": 3
},
"document-latency-insight": {
"id": "document-latency-insight",
"title": "Document request latency",
"description": "Your first network request is the most important. [Reduce its latency](https://developer.chrome.com/docs/performance/insights/document-latency) by avoiding redirects, ensuring a fast server response, and enabling text compression.",
"score": 1,
"scoreDisplayMode": "metricSavings",
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "checklist",
"items": {
"noRedirects": {
"label": "Avoids redirects",
"value": true
},
"serverResponseIsFast": {
"label": "Server responds quickly (observed 1 ms)",
"value": true
},
"usesCompression": {
"label": "Applies text compression",
"value": true
}
},
"debugData": {
"type": "debugdata",
"redirectDuration": 0,
"serverResponseTime": 1,
"uncompressedResponseBytes": 0,
"wastedBytes": 0
}
},
"guidanceLevel": 3
},
"dom-size-insight": {
"id": "dom-size-insight",
"title": "Optimize DOM size",
"description": "A large DOM can increase the duration of style calculations and layout reflows, impacting page responsiveness. A large DOM will also increase memory usage. [Learn how to avoid an excessive DOM size](https://developer.chrome.com/docs/performance/insights/dom-size).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 8,
"numericUnit": "element",
"metricSavings": {
"INP": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "statistic",
"valueType": "text",
"label": "Statistic"
},
{
"key": "node",
"valueType": "node",
"label": "Element"
},
{
"key": "value",
"valueType": "numeric",
"label": "Value"
}
],
"items": [
{
"statistic": "Total elements",
"value": {
"type": "numeric",
"granularity": 1,
"value": 8
}
},
{
"statistic": "DOM depth",
"node": {
"type": "node",
"lhId": "page-3-STRONG",
"path": "1,HTML,1,BODY,0,HEADER,0,STRONG",
"selector": "body > header > strong",
"boundingRect": {
"top": 16,
"bottom": 34,
"left": 24,
"right": 176,
"width": 152,
"height": 18
},
"snippet": "",
"nodeLabel": "Trailhead Outfitters"
},
"value": {
"type": "numeric",
"granularity": 1,
"value": 3
}
},
{
"statistic": "Most children",
"node": {
"type": "node",
"lhId": "page-2-BODY",
"path": "1,HTML,1,BODY",
"selector": "body",
"boundingRect": {
"top": 0,
"bottom": 491,
"left": 0,
"right": 412,
"width": 412,
"height": 491
},
"snippet": "",
"nodeLabel": "body"
},
"value": {
"type": "numeric",
"granularity": 1,
"value": 3
}
}
],
"debugData": {
"type": "debugdata",
"totalElements": 8,
"maxChildren": 3,
"maxDepth": 3
}
},
"guidanceLevel": 3
},
"duplicated-javascript-insight": {
"id": "duplicated-javascript-insight",
"title": "Duplicated JavaScript",
"description": "Remove large, [duplicate JavaScript modules](https://developer.chrome.com/docs/performance/insights/duplicated-javascript) from bundles to reduce unnecessary bytes consumed by network activity.",
"score": 1,
"scoreDisplayMode": "metricSavings",
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "source",
"valueType": "code",
"subItemsHeading": {
"key": "url",
"valueType": "url"
},
"label": "Source"
},
{
"key": "wastedBytes",
"valueType": "bytes",
"subItemsHeading": {
"key": "sourceTransferBytes"
},
"granularity": 10,
"label": "Duplicated bytes"
}
],
"items": [],
"debugData": {
"type": "debugdata",
"wastedBytes": 0
}
},
"guidanceLevel": 2
},
"font-display-insight": {
"id": "font-display-insight",
"title": "Font display",
"description": "Consider setting [font-display](https://developer.chrome.com/docs/performance/insights/font-display) to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with [font metric overrides](https://developer.chrome.com/blog/font-fallbacks).",
"score": 1,
"scoreDisplayMode": "metricSavings",
"metricSavings": {
"INP": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "wastedMs",
"valueType": "ms",
"label": "Est Savings"
}
],
"items": [],
"skipSumming": [
"wastedMs"
]
},
"guidanceLevel": 3
},
"forced-reflow-insight": {
"id": "forced-reflow-insight",
"title": "Forced reflow",
"description": "A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about [forced reflows](https://developer.chrome.com/docs/performance/insights/forced-reflow) and possible mitigations.",
"score": 1,
"scoreDisplayMode": "numeric",
"details": {
"type": "list",
"items": [
{
"type": "table",
"headings": [
{
"key": "source",
"valueType": "source-location",
"label": "Source"
},
{
"key": "reflowTime",
"valueType": "ms",
"granularity": 1,
"label": "Total reflow time"
}
],
"items": []
}
]
},
"guidanceLevel": 3
},
"image-delivery-insight": {
"id": "image-delivery-insight",
"title": "Improve image delivery",
"description": "Reducing the download time of images can improve the perceived load time of the page and LCP. [Learn more about optimizing image size](https://developer.chrome.com/docs/performance/insights/image-delivery)",
"score": 0,
"scoreDisplayMode": "metricSavings",
"displayValue": "Est savings of 9,295 KiB",
"metricSavings": {
"FCP": 0,
"LCP": 45550
},
"details": {
"type": "table",
"headings": [
{
"key": "node",
"valueType": "node",
"label": ""
},
{
"key": "url",
"valueType": "url",
"label": "URL",
"subItemsHeading": {
"key": "reason",
"valueType": "text"
}
},
{
"key": "totalBytes",
"valueType": "bytes",
"label": "Resource Size"
},
{
"key": "wastedBytes",
"valueType": "bytes",
"label": "Est Savings",
"subItemsHeading": {
"key": "wastedBytes",
"valueType": "bytes"
}
}
],
"items": [
{
"node": {
"type": "node",
"lhId": "page-0-IMG",
"path": "1,HTML,1,BODY,1,IMG",
"selector": "body > img",
"boundingRect": {
"top": 50,
"bottom": 290,
"left": 0,
"right": 412,
"width": 412,
"height": 240
},
"snippet": "",
"nodeLabel": "Mountain trail at dawn"
},
"url": "http://localhost:8080/hero.png",
"totalBytes": 9534606,
"wastedBytes": 9518103,
"subItems": {
"type": "subitems",
"items": [
{
"reason": "Using a modern image format (WebP, AVIF) or increasing the image compression could improve this image's download size.",
"wastedBytes": 8974606
},
{
"reason": "This image file is larger than it needs to be (2400x1400) for its displayed dimensions (412x240). Use responsive images to reduce the image download size.",
"wastedBytes": 9253633
}
]
}
}
],
"debugData": {
"type": "debugdata",
"wastedBytes": 9518103
}
},
"guidanceLevel": 3
},
"inp-breakdown-insight": {
"id": "inp-breakdown-insight",
"title": "INP breakdown",
"description": "Start investigating [how to improve INP](https://developer.chrome.com/docs/performance/insights/inp-breakdown) by looking at the longest subpart.",
"score": null,
"scoreDisplayMode": "notApplicable",
"guidanceLevel": 3
},
"lcp-breakdown-insight": {
"id": "lcp-breakdown-insight",
"title": "LCP breakdown",
"description": "Each [subpart has specific improvement strategies](https://developer.chrome.com/docs/performance/insights/lcp-breakdown). Ideally, most of the LCP time should be spent on loading the resources, not within delays.",
"score": 1,
"scoreDisplayMode": "informative",
"metricSavings": {
"LCP": 0
},
"details": {
"type": "list",
"items": [
{
"type": "table",
"headings": [
{
"key": "label",
"valueType": "text",
"label": "Subpart"
},
{
"key": "duration",
"valueType": "ms",
"label": "Duration"
}
],
"items": [
{
"subpart": "timeToFirstByte",
"label": "Time to first byte",
"duration": 2.171
},
{
"subpart": "resourceLoadDelay",
"label": "Resource load delay",
"duration": 24.957
},
{
"subpart": "resourceLoadDuration",
"label": "Resource load duration",
"duration": 366.322
},
{
"subpart": "elementRenderDelay",
"label": "Element render delay",
"duration": 1878.761
}
]
},
{
"type": "node",
"lhId": "page-0-IMG",
"path": "1,HTML,1,BODY,1,IMG",
"selector": "body > img",
"boundingRect": {
"top": 50,
"bottom": 290,
"left": 0,
"right": 412,
"width": 412,
"height": 240
},
"snippet": "",
"nodeLabel": "Mountain trail at dawn"
}
]
},
"guidanceLevel": 3
},
"lcp-discovery-insight": {
"id": "lcp-discovery-insight",
"title": "LCP request discovery",
"description": "[Optimize LCP](https://developer.chrome.com/docs/performance/insights/lcp-discovery) by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading",
"score": 0,
"scoreDisplayMode": "numeric",
"metricSavings": {
"LCP": 0
},
"details": {
"type": "list",
"items": [
{
"type": "checklist",
"items": {
"priorityHinted": {
"label": "fetchpriority=high should be applied",
"value": false
},
"requestDiscoverable": {
"label": "Request is discoverable in initial document",
"value": true
},
"eagerlyLoaded": {
"label": "LCP resources should not use loading=lazy",
"value": true
}
}
},
{
"type": "node",
"lhId": "page-0-IMG",
"path": "1,HTML,1,BODY,1,IMG",
"selector": "body > img",
"boundingRect": {
"top": 50,
"bottom": 290,
"left": 0,
"right": 412,
"width": 412,
"height": 240
},
"snippet": "",
"nodeLabel": "Mountain trail at dawn"
}
]
},
"guidanceLevel": 3
},
"legacy-javascript-insight": {
"id": "legacy-javascript-insight",
"title": "Legacy JavaScript",
"description": "Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile [Baseline](https://web.dev/articles/baseline-and-polyfills) features, unless you know you must support older browsers. [Learn why most sites can deploy ES6+ code without transpiling](https://developer.chrome.com/docs/performance/insights/legacy-javascript)",
"score": 1,
"scoreDisplayMode": "metricSavings",
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"subItemsHeading": {
"key": "location",
"valueType": "source-location"
},
"label": "URL"
},
{
"key": null,
"valueType": "code",
"subItemsHeading": {
"key": "signal"
},
"label": ""
},
{
"key": "wastedBytes",
"valueType": "bytes",
"label": "Wasted bytes"
}
],
"items": [],
"debugData": {
"type": "debugdata",
"wastedBytes": 0
}
},
"guidanceLevel": 2
},
"modern-http-insight": {
"id": "modern-http-insight",
"title": "Modern HTTP",
"description": "HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. [Learn more about using modern HTTP](https://developer.chrome.com/docs/performance/insights/modern-http).",
"score": 1,
"scoreDisplayMode": "metricSavings",
"metricSavings": {
"FCP": 0,
"LCP": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "protocol",
"valueType": "text",
"label": "Protocol"
}
],
"items": []
},
"guidanceLevel": 3
},
"network-dependency-tree-insight": {
"id": "network-dependency-tree-insight",
"title": "Network dependency tree",
"description": "[Avoid chaining critical requests](https://developer.chrome.com/docs/performance/insights/network-dependency-tree) by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.",
"score": 0,
"scoreDisplayMode": "numeric",
"metricSavings": {
"LCP": 0
},
"details": {
"type": "list",
"items": [
{
"type": "list-section",
"value": {
"type": "network-tree",
"chains": {
"31BFAD3AB70187EC6B93FB82BAA9CF37": {
"url": "http://localhost:8080/",
"navStartToEndTime": 27,
"transferSize": 825,
"isLongest": true,
"children": {
"76353.2": {
"url": "http://localhost:8080/app.js",
"navStartToEndTime": 29,
"transferSize": 362,
"isLongest": true,
"children": {}
}
}
}
},
"longestChain": {
"duration": 29
}
}
},
{
"type": "list-section",
"title": "Preconnected origins",
"description": "[preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.",
"value": {
"type": "text",
"value": "no origins were preconnected"
}
},
{
"type": "list-section",
"title": "Preconnect candidates",
"description": "Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.",
"value": {
"type": "text",
"value": "No additional origins are good candidates for preconnecting"
}
}
]
},
"guidanceLevel": 1
},
"render-blocking-insight": {
"id": "render-blocking-insight",
"title": "Render-blocking requests",
"description": "Requests are blocking the page's initial render, which may delay LCP. [Deferring or inlining](https://developer.chrome.com/docs/performance/insights/render-blocking) can move these network requests out of the critical path.",
"score": 0,
"scoreDisplayMode": "metricSavings",
"displayValue": "Est savings of 1,530 ms",
"metricSavings": {
"FCP": 1550,
"LCP": 0
},
"details": {
"type": "table",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "totalBytes",
"valueType": "bytes",
"label": "Transfer Size"
},
{
"key": "wastedMs",
"valueType": "timespanMs",
"label": "Duration"
}
],
"items": [
{
"url": "http://localhost:8080/app.js",
"totalBytes": 362,
"wastedMs": 151
}
]
},
"guidanceLevel": 3
},
"third-parties-insight": {
"id": "third-parties-insight",
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"categoryGroups[seo-mobile].description"
],
"core/config/default-config.js | seoContentGroupTitle": [
"categoryGroups[seo-content].title"
],
"core/config/default-config.js | seoContentGroupDescription": [
"categoryGroups[seo-content].description"
],
"core/config/default-config.js | seoCrawlingGroupTitle": [
"categoryGroups[seo-crawl].title"
],
"core/config/default-config.js | seoCrawlingGroupDescription": [
"categoryGroups[seo-crawl].description"
],
"core/config/default-config.js | bestPracticesTrustSafetyGroupTitle": [
"categoryGroups[best-practices-trust-safety].title"
],
"core/config/default-config.js | bestPracticesUXGroupTitle": [
"categoryGroups[best-practices-ux].title"
],
"core/config/default-config.js | bestPracticesBrowserCompatGroupTitle": [
"categoryGroups[best-practices-browser-compat].title"
],
"core/config/default-config.js | bestPracticesGeneralGroupTitle": [
"categoryGroups[best-practices-general].title"
],
"core/config/default-config.js | webmcpGroupTitle": [
"categoryGroups.webmcp.title"
],
"core/config/default-config.js | webmcpGroupDescription": [
"categoryGroups.webmcp.description"
],
"core/config/default-config.js | agentAccessibilityGroupTitle": [
"categoryGroups[agent-accessibility].title"
],
"core/config/default-config.js | agentAccessibilityGroupDescription": [
"categoryGroups[agent-accessibility].description"
],
"core/config/default-config.js | agentDiscoverabilityGroupTitle": [
"categoryGroups[agent-discoverability].title"
],
"core/config/default-config.js | agentDiscoverabilityGroupDescription": [
"categoryGroups[agent-discoverability].description"
]
}
}
}