Lighthouse MCP

{ "requestedUrl": "https://example-lcp-chain.com", "finalUrl": "https://example-lcp-chain.com", "fetchTime": "2024-01-20T12:00:00.000Z", "lighthouseVersion": "11.0.0", "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36", "categories": { "performance": { "id": "performance", "title": "Performance", "score": 0.15 } }, "audits": { "largest-contentful-paint": { "id": "largest-contentful-paint", "title": "Largest Contentful Paint", "score": 0.0, "numericValue": 12500, "numericUnit": "millisecond", "displayValue": "12.5 s" }, "largest-contentful-paint-element": { "id": "largest-contentful-paint-element", "title": "Largest Contentful Paint element", "score": null, "displayValue": "1 element found", "details": { "type": "list", "items": [ { "node": { "type": "node", "selector": "body > div.hero > img.hero-image", "nodeLabel": "Hero Image", "snippet": "<img class=\"hero-image\" src=\"/images/hero-final.jpg\" alt=\"Hero\">" } } ] } }, "critical-request-chains": { "id": "critical-request-chains", "title": "Avoid chaining critical requests", "displayValue": "18 chains found", "details": { "type": "criticalrequestchain", "chains": { "1": { "request": { "url": "https://example-lcp-chain.com", "startTime": 0, "endTime": 0.5, "responseReceivedTime": 0.4, "transferSize": 8000 }, "children": { "2": { "request": { "url": "https://example-lcp-chain.com/css/reset.css", "startTime": 0.5, "endTime": 1.2, "responseReceivedTime": 1.1, "transferSize": 15000 }, "children": { "3": { "request": { "url": "https://fonts.googleapis.com/css2?family=Roboto", "startTime": 1.2, "endTime": 2.0, "responseReceivedTime": 1.9, "transferSize": 25000 }, "children": { "4": { "request": { "url": "https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxK.woff2", "startTime": 2.0, "endTime": 2.8, "responseReceivedTime": 2.7, "transferSize": 18000 } } } } } }, "5": { "request": { "url": "https://example-lcp-chain.com/js/config.js", "startTime": 0.5, "endTime": 1.0, "responseReceivedTime": 0.9, "transferSize": 5000 }, "children": { "6": { "request": { "url": "https://example-lcp-chain.com/js/loader.js", "startTime": 1.0, "endTime": 1.8, "responseReceivedTime": 1.7, "transferSize": 12000 }, "children": { "7": { "request": { "url": "https://example-lcp-chain.com/js/framework.js", "startTime": 1.8, "endTime": 3.5, "responseReceivedTime": 3.4, "transferSize": 85000 }, "children": { "8": { "request": { "url": "https://example-lcp-chain.com/js/app.js", "startTime": 3.5, "endTime": 5.0, "responseReceivedTime": 4.9, "transferSize": 120000 }, "children": { "9": { "request": { "url": "https://example-lcp-chain.com/api/init", "startTime": 5.0, "endTime": 6.2, "responseReceivedTime": 6.1, "transferSize": 8000 }, "children": { "10": { "request": { "url": "https://example-lcp-chain.com/api/user", "startTime": 6.2, "endTime": 7.5, "responseReceivedTime": 7.4, "transferSize": 5000 }, "children": { "11": { "request": { "url": "https://example-lcp-chain.com/api/content", "startTime": 7.5, "endTime": 9.0, "responseReceivedTime": 8.9, "transferSize": 25000 }, "children": { "12": { "request": { "url": "https://example-lcp-chain.com/images/hero-final.jpg", "startTime": 9.0, "endTime": 12.5, "responseReceivedTime": 12.4, "transferSize": 850000 } } } } } } } } } } } } } } } } } } }, "longestChain": { "duration": 12500, "length": 12, "transferSize": 1176000 } } }, "lcp-lazy-loaded": { "id": "lcp-lazy-loaded", "title": "Largest Contentful Paint image was not lazily loaded", "score": 0, "details": { "type": "table", "items": [ { "node": { "type": "node", "selector": "body > div.hero > img.hero-image", "nodeLabel": "Hero Image" }, "url": "https://example-lcp-chain.com/images/hero-final.jpg", "wastedMs": 3500 } ] } }, "prioritize-lcp-image": { "id": "prioritize-lcp-image", "title": "Preload Largest Contentful Paint image", "score": 0, "numericValue": 3500, "displayValue": "Potential savings of 3,500 ms", "details": { "type": "opportunity", "items": [ { "url": "https://example-lcp-chain.com/images/hero-final.jpg", "wastedMs": 3500 } ], "overallSavingsMs": 3500 } }, "network-requests": { "id": "network-requests", "title": "Network Requests", "details": { "type": "table", "items": [ { "url": "https://example-lcp-chain.com", "startTime": 0, "endTime": 500, "transferSize": 8000, "resourceType": "Document", "statusCode": 200, "mimeType": "text/html", "resourceSize": 25000 }, { "url": "https://example-lcp-chain.com/css/reset.css", "startTime": 500, "endTime": 1200, "transferSize": 15000, "resourceType": "Stylesheet", "statusCode": 200, "mimeType": "text/css", "resourceSize": 45000 }, { "url": "https://fonts.googleapis.com/css2?family=Roboto", "startTime": 1200, "endTime": 2000, "transferSize": 25000, "resourceType": "Stylesheet", "statusCode": 200, "mimeType": "text/css", "resourceSize": 28000 }, { "url": "https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxK.woff2", "startTime": 2000, "endTime": 2800, "transferSize": 18000, "resourceType": "Font", "statusCode": 200, "mimeType": "font/woff2", "resourceSize": 18000 }, { "url": "https://example-lcp-chain.com/js/config.js", "startTime": 500, "endTime": 1000, "transferSize": 5000, "resourceType": "Script", "statusCode": 200, "mimeType": "application/javascript", "resourceSize": 8000 }, { "url": "https://example-lcp-chain.com/js/loader.js", "startTime": 1000, "endTime": 1800, "transferSize": 12000, "resourceType": "Script", "statusCode": 200, "mimeType": "application/javascript", "resourceSize": 35000 }, { "url": "https://example-lcp-chain.com/js/framework.js", "startTime": 1800, "endTime": 3500, "transferSize": 85000, "resourceType": "Script", "statusCode": 200, "mimeType": "application/javascript", "resourceSize": 250000 }, { "url": "https://example-lcp-chain.com/js/app.js", "startTime": 3500, "endTime": 5000, "transferSize": 120000, "resourceType": "Script", "statusCode": 200, "mimeType": "application/javascript", "resourceSize": 380000 }, { "url": "https://example-lcp-chain.com/api/init", "startTime": 5000, "endTime": 6200, "transferSize": 8000, "resourceType": "XHR", "statusCode": 200, "mimeType": "application/json", "resourceSize": 12000 }, { "url": "https://example-lcp-chain.com/api/user", "startTime": 6200, "endTime": 7500, "transferSize": 5000, "resourceType": "XHR", "statusCode": 200, "mimeType": "application/json", "resourceSize": 7000 }, { "url": "https://example-lcp-chain.com/api/content", "startTime": 7500, "endTime": 9000, "transferSize": 25000, "resourceType": "XHR", "statusCode": 200, "mimeType": "application/json", "resourceSize": 65000 }, { "url": "https://example-lcp-chain.com/images/hero-final.jpg", "startTime": 9000, "endTime": 12500, "transferSize": 850000, "resourceType": "Image", "statusCode": 200, "mimeType": "image/jpeg", "resourceSize": 850000 } ] } } } }