Editorial guide based on official documentation; not a hands-on product test.
A step-by-step way to diagnose a slow WordPress site, prioritize the biggest bottleneck, and measure whether each change actually helps.
Start with a repeatable measurement
Open one representative page on a phone connection and record its URL, date, theme, active plugins, and test conditions. Run PageSpeed Insights, then check the browser network panel to see when the server answers and which image, font, or script takes the longest. A single score is not a diagnosis: compare multiple runs and, when available, field data from real visitors. Save a before screenshot so you can tell whether a visual change caused a regression.
Separate server delay from page weight
If the document itself responds slowly, inspect hosting resources, database-heavy requests, and uncached dynamic pages. If HTML is quick but the page becomes visible late, look at image bytes, render-blocking styles, fonts, and JavaScript. Do not install another optimization plugin until you know which layer is slow. WordPress documentation points to hosting, configuration, images, plugins, caching, and software versions as different performance factors.
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