Website Speed Checker

Topics: Performance and preview

Coming soon

This tool usually needs secure server-side calls, third-party APIs, or heavy processing (for example live DNS, WHOIS, or crawl jobs). We are wiring a safe version next—use the working tools in the sidebar for now.

Guide: Website Speed Checker

Topics in this category: Performance and preview

Performance and SEO

Google uses page experience signals including Core Web Vitals. Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) summarize loading, responsiveness, and visual stability.

Compress images, use efficient caching, minimize render-blocking JavaScript, and serve stable fonts and ads to protect CLS.