Performance Report for https://www.massgeneral.org/surgery

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\": 679.643000125885}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2\", \"wastedMs\": 623.8090000152588}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOmCnqEu92Fr1Mu7GxKKTU1Kvnz.woff2\", \"wastedMs\": 189.63399982452393}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOlCnqEu92Fr1MmEU9fChc4AMP6lbBP.woff2\", \"wastedMs\": 257.375}]"

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\/surgery\", \"responseTime\": 454.876}]"

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,6,DIV,0,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\": 807.439, \"percent\": \"14%\"}, {\"phase\": \"Load Delay\", \"timing\": 0, \"percent\": \"0%\"}, {\"phase\": \"Load Time\", \"timing\": 0, \"percent\": \"0%\"}, {\"phase\": \"Render Delay\", \"timing\": 5019.9238000000005, \"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

["body > div.container-fluid","div.modal-body > p > a.privacy_policy > span","div.hero-area__body > div.hero-content > div.hero-content__inner > h1.hero-content__title","div.breadcrumbs > div.breadcrumbs__inner > nav.breadcrumbs__pages > ul.page-trail","div.row > div.col-4 > div.global-header__mobile-nav > div.mobile-search"]

["body > div.container-fluid","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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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.

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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.

[]

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.

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

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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.

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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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