WEB-SLOW-TTFB
Slow time to first byte
What it means
The server took more than 1.5 seconds to start responding; that delay is felt on every page view.
How to fix it
- 1Profile the application, add page caching, and check database and upstream latency.
Re-check after the change
DNS changes can take up to the record's TTL to be seen; use Re-run on the result page to bypass our 10-minute cache.