Speed, Server & Security
Review performance data, mobile viewport signals, security headers, SSL, DNS and server access logs. Use this group when a page feels slow, a launch needs a technical check, HTTPS is failing, or crawler behavior needs investigation.
Problem fixes and how-to guides
Fix guideHow to improve page speed: a practical Core Web Vitals checklistTest mobile and desktop, find the biggest opportunity (usually images, render-blocking files or server response) and fix it…Fix guideMobile viewport and mobile usability issues: how to fix themDeclare a responsive viewport, then check for horizontal scrolling, small tap targets and unreadable text on real devices.Fix guideHow to add security headers (HSTS, CSP and more)Security headers instruct browsers to behave more safely. Review what is missing, add headers one at a time and test that your…Fix guideSSL certificate errors: how to diagnose and fix themCheck the hostname, validity dates and chain. Most warnings come from an expired certificate, a name mismatch or a missing…Fix guideHTTP 5xx errors: protect search visibility during server failures5xx responses indicate that the server could not successfully handle a request. Find the failure pattern, stabilize the service…GuideCore Web Vitals: field data vs lab tests explainedField data reflects real-user experiences over time, while lab tests run in a controlled environment. Use both: field data…Fix guideHow to improve Largest Contentful Paint (LCP)LCP measures when the largest visible content element is rendered. Improve the actual LCP resource and the path that delays it…Fix guideHow to improve Interaction to Next Paint (INP)INP measures responsiveness across user interactions. Diagnose the interaction and main-thread work that delays the next visual…Fix guideCumulative Layout Shift (CLS): find and prevent unexpected movementCLS captures unexpected layout movement during a page visit. Reserve space for late-loading content and avoid injecting elements…
Tool guides
Tool guideHow to use the Page Speed CheckerRequest Lighthouse performance data from Google PageSpeed Insights. Learn what to enter, how to read the result and what to do…Tool guideHow to use the Mobile-Friendly & Viewport CheckerInspect viewport tags and mobile-related markup signals. Learn what to enter, how to read the result and what to do next.Tool guideHow to use the Security Headers CheckerReview headers such as HSTS, CSP, frame, referrer and permissions policies, plus caching/compression signals. Learn what to…Tool guideHow to use the SSL Certificate CheckerInspect a TLS certificate, including subject, issuer and expiration details. Learn what to enter, how to read the result and…Tool guideHow to use the DNS CheckerInspect common DNS records including A, AAAA, CNAME, MX, NS, TXT and SOA. Learn what to enter, how to read the result and what…Tool guideHow to use the SEO Log File AnalyzerAnalyze pasted Apache/Nginx access logs for Googlebot visits, HTTP statuses and crawl patterns. Learn what to enter, how to read…