What is TTFB?
TTFB (Time To First Byte) measures the delay between sending an HTTP request and receiving the first byte of the server's response. It is a key indicator of your hosting and backend responsiveness.
A high TTFB hurts both user experience and SEO: Google recommends a TTFB under 800 ms. It directly affects Largest Contentful Paint (LCP) and therefore your Core Web Vitals.
Frequently asked questions
What is a good TTFB?
A TTFB below 200 ms is excellent, up to 500 ms is good, and up to 800 ms is acceptable. Beyond that, optimize caching, hosting or server-side code.
How can I reduce my TTFB?
Enable full-page caching, use a CDN, optimize your SQL queries, move to HTTP/2 or HTTP/3, and pick hosting close to your visitors.
Does TTFB impact SEO?
Yes. TTFB drives LCP, one of the Core Web Vitals used as a ranking signal by Google. A slow server also degrades crawl frequency.