Slow Time to First Byte
What this means
Measured TTFB is above 800ms, so every other metric on the page starts late no matter how well the front end is built.
How to fix it
Add server-side or edge caching, optimise the slow queries behind the response, and serve from a CDN closer to visitors.
Fix effort
This check needs a developer fix: it turns on a routing, hosting or infrastructure decision that no automatic edit can make safely.
Authoritative source
Find every page this affects
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