![]() ![]() Unexpected layout shifts often cause unintentional clicking/tapping on undesired content. Use efficient CSS selectors (deprecated).Specify a viewport for mobile browsers (deprecated).Specify a Vary: Accept-Encoding header (deprecated).Serve static content from a cookieless domain (deprecated).Remove query strings from static resources (deprecated).Parallelize downloads across hostnames (deprecated).Optimize the order of styles and scripts (deprecated).Make landing page redirects cacheable (deprecated).Improve server response time (deprecated).Defer loading of JavaScript (deprecated).Combine external JavaScript (deprecated).Avoid Flash on mobile webpages (deprecated).Avoid CSS Avoid CSS expressions (deprecated).Use passive listeners to improve scrolling performance.Use explicit width and height on image elements.Serve static assets with an efficient cache policy.Replace large JavaScript libraries with smaller alternatives (deprecated).Remove duplicate modules in JavaScript bundles.Lazy load third-party resources with facades.Keep request counts low and transfer sizes small.Ensure text remains visible during webfont load.Don't lazy load Largest Contentful Paint image.Avoid serving legacy JavaScript to modern browsers.
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