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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

Tap interactions may be delayed by up to 300 ms if the viewport is not optimized for mobile.

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being served over HTTPS. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more about HTTPS.

Make sure that you redirect all HTTP traffic to HTTPS in order to enable secure web features for all your users. Learn more.