wp-performance/references/server-timing.md

Server-Timing (Performance Lab)

Use this file when you can enable Server-Timing metrics and want backend-only inspection via HTTP headers.

Performance Lab plugin:

• https://wordpress.org/plugins/performance-lab/

Benchmarking guidance:

• https://make.wordpress.org/performance/handbook/measuring-performance/benchmarking-server-timing/

Backend-only approach:

• Enable the relevant module/standalone plugin.
• Request a URL and inspect the Server-Timing header:
• curl -sS -D - https://example.test/ -o /dev/null | rg -i \"^server-timing:\"

Guardrails:

• Don’t enable experimental modules in production without approval.