Measure total timings

curl -s -o /dev/null -w 'dns=%{time_namelookup} connect=%{time_connect} ttfb=%{time_starttransfer} total=%{time_total}
' https://api.example.com/health

Inspect response headers

curl -I https://api.example.com/endpoint

Trace DNS resolution
```
dig +short api.example.com
```
Correlate app logs
```
grep 'request_id=<id>' /var/log/app.log
```

Notes

Compare fast and slow requests with the same payload.
Check if latency is network, app, or database bound.

Related commands: curl -w, dig, grep

Related workflows: Ask an agent to investigate a performance issue