What it is
Time to First Byte is how long the server takes to start responding. A slow TTFB delays everything that follows, so a fast page is impossible if the server is sluggish to begin with. Slow server response. Delays everything downstream incl. LCP and crawl efficiency.
Why does excessive ttfb matter for AI search?
Delays everything downstream incl. LCP and crawl efficiency.
How do you fix it?
Improve hosting, caching, CDN.
How do you find it on your site?
- Measure TTFB with curl -w or in the DevTools Network tab.
- Check whether it is consistently slow or only under load.
- Look at server processing, database queries, and whether a CDN or caching layer is in front.
- Add caching or a CDN, and optimise the slowest server work.
Which ranking and citation factors does it touch?
TTFB is upstream of LCP and the whole load. Reducing it improves Core Web Vitals across the board.
What is the impact?
Low-medium. Inferred.
What is the evidence?
TTFB affects LCP and crawl; improve server response. web.dev, Core Web Vitals (Google); Google Search Central, Large site owner’s guide to managing crawl budget
Sources
Frequently asked questions about excessive ttfb
What does "Excessive TTFB" mean?
Slow server response.
How do you fix excessive TTFB?
Improve hosting, caching, CDN.