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Measures total page load time and gives a detailed waterfall of every asset – helps pinpoint exactly which resource is slowing down the page (images, scripts, fonts).
Real‑world scenario: Your homepage loads in 4.2 seconds, above the 3‑second threshold. You run the checker and discover a tracking script from an old plugin takes 1.8 seconds. You remove it and load time drops to 2.1 seconds – mobile conversions immediately tick up.
How to use it:
Check out the more detailed Page Insights checker tool http://webmastertools.seowolf.org/pagespeed-insights-checker