How to Test WordPress Site Speed

Use lab tools for diagnosis and field data for what real visitors experience.

Lab versus field

Lighthouse and PageSpeed lab runs simulate a controlled environment. Chrome UX Report field data, when available, aggregates real-user experience. They answer different questions.

Test multiple templates

Homepage-only testing hides problems on articles, products, checkout, landing pages and logged-in flows.

Run comparable tests

Use similar test locations and conditions when comparing before and after. One score is noisy; look for repeatable changes.

Read the waterfall

Scores summarize symptoms. A request waterfall and performance trace often reveal the actual causes: server delay, render-blocking resources, oversized media or long JavaScript tasks.

Track outcomes

Keep a simple benchmark sheet with date, page, configuration and key metrics so optimizations are evidence-based.