GTMetrix & Web Vitals Competitor
Website Speed & TTFB Performance Audit
Audit any URL for Time to First Byte (TTFB), CDN Edge identification, HTTP/3 QUIC support, Brotli vs Gzip compression, and Cache-Control header efficiency.
Enter a domain above and click “Run Audit” to test its live TTFB, CDN, HTTP/3, and Brotli compression.
Knowledge Base & FAQ
Website Performance & TTFB Optimization FAQ
Tips for optimizing Core Web Vitals, CDN edge caches, and modern compression algorithms.
TTFB measures the duration from when a client makes an HTTP request to when the first byte of data arrives from the server. Google considers TTFB under 200ms optimal. Slow TTFB delays all downstream DOM parsing, increasing Largest Contentful Paint (LCP) and harming Core Web Vitals rankings.