Performance Report for https://www.massgeneral.org/visit/maps-and-directions

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.

"[{\"url\": \"https:\/\/map.concept3d.com\/js\/runtime.js?v=5.7.7\", \"total\": 377.5578000000013, \"scripting\": 356.50800000000123, \"scriptParseCompile\": 0.0663}, {\"url\": \"Unattributable\", \"total\": 328.01189999999895, \"scripting\": 85.79219999999997, \"scriptParseCompile\": 0}, {\"url\": \"https:\/\/mgb.containers.piwik.pro\/41b8ae76-3079-47d5-aaf8-040ee367d152.js\", \"total\": 303.31710000000004, \"scripting\": 298.23, \"scriptParseCompile\": 3.7332}, {\"url\": \"https:\/\/www.massgeneral.org\/visit\/maps-and-directions\", \"total\": 207.19409999999996, \"scripting\": 4.907100000000001, \"scriptParseCompile\": 0.6279}, {\"url\": \"https:\/\/map.concept3d.com\/js\/index.js?v=5.7.7\", \"total\": 194.5446000000001, \"scripting\": 34.54800000000004, \"scriptParseCompile\": 18.9132}, {\"url\": \"https:\/\/www.googletagmanager.com\/gtag\/js?id=G-C314QG7LHT&l=dataLayer&cx=c\", \"total\": 181.0523999999999, \"scripting\": 128.6786999999999, \"scriptParseCompile\": 3.0585}, {\"url\": \"https:\/\/d34ap6s6npht7p.cloudfront.net\/cdn\/js\/main.min.js\", \"total\": 151.90979999999976, \"scripting\": 76.55639999999977, \"scriptParseCompile\": 3.2016}, {\"url\": \"https:\/\/cdn.levelaccess.net\/accessjs\/YW1wMTI1MDM\/access.js\", \"total\": 126.66989999999996, \"scripting\": 95.56919999999998, \"scriptParseCompile\": 4.830299999999999}, {\"url\": \"https:\/\/www.google-analytics.com\/analytics.js\", \"total\": 117.31289999999998, \"scripting\": 96.59069999999998, \"scriptParseCompile\": 3.1224}, {\"url\": \"https:\/\/www.massgeneral.org\/assets\/MGH\/js\/3.bundle.js?ab42ae\", \"total\": 108.82559999999988, \"scripting\": 103.21199999999988, \"scriptParseCompile\": 1.7619}, {\"url\": \"https:\/\/maps.googleapis.com\/maps\/api\/js?libraries=places,drawing,geometry&client=gme-concept3dinc&channel=969&callback=initMap\", \"total\": 85.12739999999987, \"scripting\": 60.95969999999987, \"scriptParseCompile\": 1.2186}, {\"url\": \"https:\/\/cdn.callrail.com\/companies\/763824717\/7f48cebc793bc5770b5c\/12\/swap.js\", \"total\": 83.87009999999994, \"scripting\": 78.06719999999993, \"scriptParseCompile\": 2.6172}, {\"url\": \"https:\/\/www.googletagmanager.com\/gtag\/js?id=UA-35820275-14&l=dataLayer&cx=c\", \"total\": 57.82109999999999, \"scripting\": 56.78369999999999, \"scriptParseCompile\": 0.9831}]"

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\/opensans\/v40\/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTUGmu0SC55K5gw.woff2\", \"wastedMs\": 702.5100002288818}]"

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\/visit\/maps-and-directions\", \"responseTime\": 347.747}]"

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-DIV\", \"path\": \"1,HTML,1,BODY,5,DIV,0,DIV,2,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,3,DIV\", \"type\": \"node\", \"snippet\": \"<div class=\\\"hero-content__description\\\">\", \"selector\": \"div.hero-area__body > div.hero-content > div.hero-content__inner > div.hero-content__description\", \"nodeLabel\": \"Massachusetts General Hospital's main campus spans nearly 30 buildings and incl\u2026\", \"boundingRect\": {\"top\": 252, \"left\": 24, \"right\": 761, \"width\": 737, \"bottom\": 327, \"height\": 75}}}], \"headings\": [{\"key\": \"node\", \"label\": \"Element\", \"valueType\": \"node\"}]}, {\"type\": \"table\", \"items\": [{\"phase\": \"TTFB\", \"timing\": 695.528, \"percent\": \"13%\"}, {\"phase\": \"Load Delay\", \"timing\": 0, \"percent\": \"0%\"}, {\"phase\": \"Load Time\", \"timing\": 0, \"percent\": \"0%\"}, {\"phase\": \"Render Delay\", \"timing\": 4846.593999999998, \"percent\": \"87%\"}], \"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.content > div.container > div.wysiwyg > h2","div.hero-area__body > div.hero-content > div.hero-content__inner > h1.hero-content__title","div.hero-content__inner > ul.hero-buttons > li > a.button","div.hero-content__inner > ul.hero-buttons > li > a.button","div.modal-body > p > a.privacy_policy > span"]

["body > div.container-fluid","div.content > div.container > div.wysiwyg > h2"]

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\": 1709.7585000000029, \"groupLabel\": \"Script Evaluation\"}, {\"group\": \"other\", \"duration\": 413.4188999999992, \"groupLabel\": \"Other\"}, {\"group\": \"styleLayout\", \"duration\": 388.2453000000001, \"groupLabel\": \"Style & Layout\"}, {\"group\": \"scriptParseCompile\", \"duration\": 84.2967, \"groupLabel\": \"Script Parsing & Compilation\"}, {\"group\": \"parseHTML\", \"duration\": 54.84330000000004, \"groupLabel\": \"Parse HTML & CSS\"}, {\"group\": \"garbageCollection\", \"duration\": 25.042499999999993, \"groupLabel\": \"Garbage Collection\"}, {\"group\": \"paintCompositeRender\", \"duration\": 11.5314, \"groupLabel\": \"Rendering\"}]"

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.

[]

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\": 976, \"totalBytes\": 3080}, {\"url\": \"https:\/\/d34ap6s6npht7p.cloudfront.net\/cdn\/css\/main.css\", \"wastedMs\": 312, \"totalBytes\": 39646}]"

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

"[]"

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.

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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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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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