How much does reducing server response times affect SEO performance?

Short answer: A fixed number would be dishonest: the gain depends on how bad your current response time is and where the bottleneck sits. The effect works through two channels: TTFB is the floor under LCP, and a slow server also throttles Googlebot's crawl rate. The right approach is measuring against your own baseline.

A measurement-first method

• Take a baseline: TTFB and LCP distributions in CrUX, average response time in the Search Console Crawl Stats report.
• The usual order of fixes: HTML caching and a CDN, database query optimization, removing unnecessary redirects.
• Use public thresholds as a compass: good LCP sits under 2.5 seconds, good TTFB under 0.8 seconds.
• After the change, compare equal-length periods and verify the crawl shift in your logs.

An honest frame

The ranking effect is indirect: speed alone will not rescue weak content, but a slow server actively keeps good content from reaching users and bots. TYS Digital Performance justifies speed investments through exactly these metrics on every project and reports the outcome with the same ones.