Performance Report for https://reviewed.usatoday.com/home-outdoors/best-right-now/the-best-fitness-trackers

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\": 0.11215814705126644, \"cumulativeLayoutShiftMainFrame\": 0.11215814705126644}, \"newEngineResultDiffered\": false, \"cumulativeLayoutShiftMainFrame\": 0.11215814705126644}]"

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.

"[]"

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\": 1171.5489999055862}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2\", \"wastedMs\": 1449.183000087738}, {\"url\": \"https:\/\/fonts.gstatic.com\/s\/roboto\/v18\/KFOmCnqEu92Fr1Mu7GxKKTU1Kvnz.woff2\", \"wastedMs\": 98.36900007724762}]"

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:\/\/reviewed.usatoday.com\/home-outdoors\/best-right-now\/the-best-fitness-trackers\", \"responseTime\": 17.128}]"

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

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["main.main-content-wrap > main.main > div.container > figure.row","body.tracking-page > nav.navbar > a.navbar__brand","div.container > div.row > div.col-12 > p"]

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\": 3902.547600000112, \"groupLabel\": \"Script Evaluation\"}, {\"group\": \"styleLayout\", \"duration\": 1759.9356000000002, \"groupLabel\": \"Style & Layout\"}, {\"group\": \"other\", \"duration\": 1063.5647999999992, \"groupLabel\": \"Other\"}, {\"group\": \"scriptParseCompile\", \"duration\": 194.31930000000003, \"groupLabel\": \"Script Parsing & Compilation\"}, {\"group\": \"garbageCollection\", \"duration\": 118.4864999999986, \"groupLabel\": \"Garbage Collection\"}, {\"group\": \"paintCompositeRender\", \"duration\": 114.8222999999997, \"groupLabel\": \"Rendering\"}, {\"group\": \"parseHTML\", \"duration\": 94.44899999999993, \"groupLabel\": \"Parse HTML & CSS\"}]"

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.

["div.videoCube > a.item-thumbnail-href > div.thumbBlock_holder > span.thumbBlock"]

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().

"[{\"source\": {\"url\": \"https:\/\/cdn.taboola.com\/libtrc\/userx.20240326-2-RELEASE.es6.js\", \"line\": 2, \"type\": \"source-location\", \"column\": 9416, \"urlProvider\": \"network\"}}]"

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.videoCube > a.item-thumbnail-href > div.thumbBlock_holder > span.thumbBlock","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.lazyload","div > figure > figure.image-wrapper > img.attachment__award","div.col-12 > div.footer__reviewed_logo > a > img.footer__logo","ul.footer-links__social-list > li > a.footer-links__list-href > img","div.ot-pc-footer > div.ot-pc-footer-logo > a > img","div.search-box__featured > div.search-box__featured-item > a > img.lazyload"]

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:\/\/reviewed.usatoday.com\/packs\/css\/stylesheets-201e1f45.css\", \"wastedMs\": 329, \"totalBytes\": 51671}, {\"url\": \"https:\/\/reviewed.usatoday.com\/packs\/js\/application_synchronous-ef00af9fd0fe3459f7d3.js\", \"wastedMs\": 165, \"totalBytes\": 32076}]"

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

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

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