Performance Report for https://reviewed.usatoday.com/sleep/best-right-now/the-best-mattress-toppers

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.

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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.item-thumbnail-href > div.thumbBlock_holder > span.thumbBlock > span.thumbnail-overlay","div.col-12 > div.container > div.row > div.col-12"]

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.

"[]"

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.

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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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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.

[]

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.

["div > div.ot-pc-header > div.ot-pc-logo > img","div.container > figure#mobile-trust-image > div.row > img.lazyload","div > figure > figure.image-wrapper > img.lazyload","div > figure > figure.image-wrapper > img.lazyload","div > figure > figure.image-wrapper > img.lazyload","div > figure > figure.image-wrapper > img.lazyload","div > figure > figure.image-wrapper > img.attachment__award","div > figure > figure.image-wrapper > img.lazyload","div.col-12 > div.footer__reviewed_logo > a > img.footer__logo","div > figure > figure.image-wrapper > img.lazyload","ul.footer-links__social-list > li > a.footer-links__list-href > img","div.ot-pc-footer > div.ot-pc-footer-logo > a > img"]

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.

[]

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 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.

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