Performance Report for https://www.massgeneral.org/orthopaedics/sports-medicine

Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more about the Cumulative Layout Shift metric.

"[{\"newEngineResult\": {\"cumulativeLayoutShift\": 0.11216162420382166, \"cumulativeLayoutShiftMainFrame\": 0.11216162420382166}, \"newEngineResultDiffered\": false, \"cumulativeLayoutShiftMainFrame\": 0.11216162420382166}]"

A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows. Learn how to avoid an excessive DOM size.

["a.arrow-link > span.icon > svg.svg-inline--fa > path","div.main-nav-col__inner > div.main-nav-col__content > div.row > ul.main-nav-col__link-list"]

First Contentful Paint marks the time at which the first text or image is painted. Learn more about the First Contentful Paint metric.

"[]"

First Meaningful Paint measures when the primary content of a page is visible. Learn more about the First Meaningful Paint metric.

"[]"

Leverage the `font-display` CSS feature to ensure text is user-visible while webfonts are loading. Learn more about `font-display`.

"[{\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2\", \"wastedMs\": 647.0989999771118}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2\", \"wastedMs\": 450.4619998931885}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2\", \"wastedMs\": 0.34399986267089844}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2\", \"wastedMs\": 0.3710002899169922}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOmCnqEu92Fr1Mu7GxKKTU1Kvnz.woff2\", \"wastedMs\": 119.68800020217896}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOlCnqEu92Fr1MmEU9fChc4AMP6lbBP.woff2\", \"wastedMs\": 108.70099973678587}]"

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.

"[{\"url\": \"https:\/\/www.massgeneral.org\/orthopaedics\/sports-medicine\", \"responseTime\": 839.687}]"

Largest Contentful Paint marks the time at which the largest text or image is painted. Learn more about the Largest Contentful Paint metric

"[]"

This is the largest contentful element painted within the viewport. Learn more about the Largest Contentful Paint element

"[{\"type\": \"table\", \"items\": [{\"node\": {\"lhId\": \"page-0-P\", \"path\": \"1,HTML,1,BODY,4,DIV,0,DIV,0,DIV,2,DIV,2,FOOTER,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,P\", \"type\": \"node\", \"snippet\": \"<p>\", \"selector\": \"div#footerModal > div.modal-content > div.modal-body > p\", \"nodeLabel\": \"We use cookies and other tools to enhance your experience on our website and to\u2026\", \"boundingRect\": {\"top\": 448, \"left\": 100, \"right\": 686, \"width\": 586, \"bottom\": 537, \"height\": 90}}}], \"headings\": [{\"key\": \"node\", \"label\": \"Element\", \"valueType\": \"node\"}]}, {\"type\": \"table\", \"items\": [{\"phase\": \"TTFB\", \"timing\": 1197.011, \"percent\": \"14%\"}, {\"phase\": \"Load Delay\", \"timing\": 0, \"percent\": \"0%\"}, {\"phase\": \"Load Time\", \"timing\": 0, \"percent\": \"0%\"}, {\"phase\": \"Render Delay\", \"timing\": 7164.731, \"percent\": \"86%\"}], \"headings\": [{\"key\": \"phase\", \"label\": \"Phase\", \"valueType\": \"text\"}, {\"key\": \"percent\", \"label\": \"% of LCP\", \"valueType\": \"text\"}, {\"key\": \"timing\", \"label\": \"Timing\", \"valueType\": \"ms\"}]}]"

These DOM elements contribute most to the CLS of the page. Learn how to improve CLS

["div#sectionju37niqm > div#rowju37niqn > div#colju37niqo > div#iw_comp1554416841121","div.modal-body > p > a.privacy_policy > span","div.breadcrumbs > div.breadcrumbs__inner > nav.breadcrumbs__pages > ul.page-trail","div.row > div.col-4 > div.global-header__mobile-nav > div.mobile-search"]

["div#sectionju37niqm > div#rowju37niqn > div#colju37niqo > div#iw_comp1554416841121","div.modal-body > p > a.privacy_policy > span","div.row > div.col-4 > div.global-header__mobile-nav > div.mobile-search"]

Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. For your bundled JavaScript, adopt a modern script deployment strategy using module/nomodule feature detection to reduce the amount of code shipped to modern browsers, while retaining support for legacy browsers. Learn how to use modern JavaScript

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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

"[{\"group\": \"scriptEvaluation\", \"duration\": 1225.8696000000084, \"groupLabel\": \"Script Evaluation\"}, {\"group\": \"styleLayout\", \"duration\": 504.0038999999997, \"groupLabel\": \"Style & Layout\"}, {\"group\": \"other\", \"duration\": 437.634, \"groupLabel\": \"Other\"}, {\"group\": \"parseHTML\", \"duration\": 83.39219999999986, \"groupLabel\": \"Parse HTML & CSS\"}, {\"group\": \"scriptParseCompile\", \"duration\": 68.9244, \"groupLabel\": \"Script Parsing & Compilation\"}, {\"group\": \"paintCompositeRender\", \"duration\": 45.426899999999776, \"groupLabel\": \"Rendering\"}, {\"group\": \"garbageCollection\", \"duration\": 20.8743, \"groupLabel\": \"Garbage Collection\"}]"

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.

[]

Image formats like WebP and AVIF often provide better compression than PNG or JPEG, which means faster downloads and less data consumption. Learn more about modern image formats.

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Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. Learn how to eliminate render-blocking resources.

"[{\"url\": \"https:\/\/d34ap6s6npht7p.cloudfront.net\/cdn\/css\/grid.css\", \"wastedMs\": 993, \"totalBytes\": 3087}, {\"url\": \"https:\/\/d34ap6s6npht7p.cloudfront.net\/cdn\/css\/main.css\", \"wastedMs\": 317, \"totalBytes\": 39654}]"

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.

"[{\"url\": \"https:\/\/www.massgeneral.org\/orthopaedics\/sports-medicine\", \"responseTime\": 839.687}]"

Speed Index shows how quickly the contents of a page are visibly populated. Learn more about the Speed Index metric.

"[]"

Some third-party embeds can be lazy loaded. Consider replacing them with a facade until they are required. Learn how to defer third-parties with a facade.

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Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading. Learn how to minimize third-party impact.

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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.

[]

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

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Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

["div.col-8 > div.global-header__logo > a > img"]

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.

"[{\"url\": \"https:\/\/d34ap6s6npht7p.cloudfront.net\/cdn\/css\/main.css\", \"totalBytes\": 39293, \"wastedBytes\": 32510, \"wastedPercent\": 82.73764019316377}]"

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

"[{\"url\": \"https:\/\/www.youtube.com\/s\/player\/9135c2ab\/player_ias.vflset\/lt_LT\/base.js\", \"totalBytes\": 811629, \"wastedBytes\": 571970, \"wastedPercent\": 70.47189978379774}, {\"url\": \"https:\/\/www.youtube.com\/s\/player\/9135c2ab\/www-embed-player.vflset\/www-embed-player.js\", \"totalBytes\": 97317, \"wastedBytes\": 74398, \"wastedPercent\": 76.44900706832716}, {\"url\": \"https:\/\/www.youtube.com\/s\/player\/9135c2ab\/www-embed-player.vflset\/www-embed-player.js\", \"totalBytes\": 97317, \"wastedBytes\": 50907, \"wastedPercent\": 52.310822802239834}, {\"url\": \"https:\/\/d34ap6s6npht7p.cloudfront.net\/cdn\/js\/main.min.js\", \"totalBytes\": 96398, \"wastedBytes\": 49764, \"wastedPercent\": 51.623124270296906}, {\"url\": \"https:\/\/www.youtube.com\/s\/player\/9135c2ab\/www-widgetapi.vflset\/www-widgetapi.js\", \"totalBytes\": 68165, \"wastedBytes\": 48955, \"wastedPercent\": 71.81765028486478}, {\"url\": \"https:\/\/mgb.containers.piwik.pro\/41b8ae76-3079-47d5-aaf8-040ee367d152.js\", \"totalBytes\": 81525, \"wastedBytes\": 31572, \"wastedPercent\": 38.727472491431755}]"

HTTP/2 offers many benefits over HTTP/1.1, including binary headers and multiplexing. Learn more about HTTP/2.

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A long cache lifetime can speed up repeat visits to your page. Learn more about efficient cache policies.

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Optimized images load faster and consume less cellular data. Learn how to efficiently encode images.

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Consider marking your touch and wheel event listeners as `passive` to improve your page's scroll performance. Learn more about adopting passive event listeners.

"[{\"source\": {\"url\": \"https:\/\/www.youtube.com\/s\/player\/9135c2ab\/player_ias.vflset\/lt_LT\/base.js\", \"line\": 8807, \"type\": \"source-location\", \"column\": 199, \"urlProvider\": \"network\"}}, {\"source\": {\"url\": \"https:\/\/www.massgeneral.org\/assets\/MGH\/js\/6.bundle.js?ab42ae\", \"line\": 0, \"type\": \"source-location\", \"column\": 52564, \"urlProvider\": \"network\"}}]"

Text-based resources should be served with compression (gzip, deflate or brotli) to minimize total network bytes. Learn more about text compression.

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