Performance Report for https://www.mountsinai.org/locations/mount-sinai/care/cancer

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.

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

"[{\"newEngineResult\": {\"cumulativeLayoutShift\": 0.2711126339641906, \"cumulativeLayoutShiftMainFrame\": 0.2711126339641906}, \"newEngineResultDiffered\": false, \"cumulativeLayoutShiftMainFrame\": 0.2711126339641906}]"

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

["div.col-xs-12 > h1.title > a > i.fa","body.extended-nav"]

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

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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`.

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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.mountsinai.org\/locations\/mount-sinai\/care\/cancer\", \"responseTime\": 249.74}]"

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

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

["div.container > div.row > div.two-thirds > main.mob-readmore__container--outer","body.extended-nav > div.container-fluid > div.row > div.container","div.row > div.container > div.row > div.two-thirds","body.extended-nav > header.c03-header > div.white-bg > div.container","body.extended-nav > div.container-fluid","body.extended-nav > div.c03-location-details > div.container","body.extended-nav > header#navbar > div.blue-sky-bg > div.container","body.extended-nav > header#navbar","body.extended-nav > div.c03-location-details > div.container > div.location-detail","div.full-width > nav.breadcrumbs > div.container > ul.share","div.container > div.mobile-menu > div.drop-subnav > ul.link-list","div.container > div.mobile-menu > div.drop-subnav > ul.link-list","body.extended-nav > div#avm_chat_widget_dafef244-f2b4-44f7-92d6-343dcf6ed55d > div.avaamo__icon > a.avm-bot-avatar","div.white-bg > div.container > div.mobile-menu > button.collapsed","div.white-bg > div.container > div.mobile-menu > button.hidden-xs"]

["div.container > div.row > div.two-thirds > main.mob-readmore__container--outer","body.extended-nav > div.container-fluid > div.row > div.container","body.extended-nav > header.c03-header > div.white-bg > div.container","body.extended-nav > div.container-fluid","body.extended-nav > div.container-fluid","div.full-width > nav.breadcrumbs > div.container > ul.share","body.extended-nav > div#avm_chat_widget_dafef244-f2b4-44f7-92d6-343dcf6ed55d > div.avaamo__icon > a.avm-bot-avatar"]

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

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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.

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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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For users on slow connections, external scripts dynamically injected via `document.write()` can delay page load by tens of seconds. Learn how to avoid document.write().

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Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. Learn how to defer offscreen images.

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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.

"[]"

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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Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

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Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

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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

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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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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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Consider adding `preconnect` or `dns-prefetch` resource hints to establish early connections to important third-party origins. Learn how to preconnect to required origins.

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Serve images that are appropriately-sized to save cellular data and improve load time. Learn how to size images.

["div.owl-item > div.item > picture > img","div.owl-item > div.item > picture > img"]

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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