TROUBLESHOOTING
Name the slow phase before touching config
Where's the time?
Break the request into user → edge → cache → origin. The delay lives in one segment; find it first.
Client-side signals
cf-ray (which colo), cf-cache-status (HIT/MISS/DYNAMIC), Server-Timing, and browser dev tools or curl timing.
Then go deeper
Once you know the phase, use internal tooling to see exactly what happened to the request and the trend behind it.
Cloudflare Application Performance16