Diagnose before you optimise — guessing wastes time.
- Run a speed test with Google PageSpeed Insights, GTmetrix, or WebPageTest.
- Read the report's opportunities/diagnostics — it names the biggest issues (large images, render-blocking scripts, slow server response).
- Check server response time (TTFB) — if it's high, look at caching, PHP version, and resource usage.
- Use the browser's developer tools (Network tab) to see which files take longest to load.
Tip: Fix the largest items first, then re-test. One or two changes often account for most of the improvement.
