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Page Speed Checker
Measure DNS, connect, TTFB, transfer and total page weight.
About the Page Speed Checker
The measurement here is server-side and honest about what it covers: DNS time, connection time, TLS handshake, time to first byte, total transfer time, response size, compression and cache headers, plus a count of the scripts, stylesheets, images and fonts the page asks for.
That is the half of performance you control directly. Time to first byte above roughly 600 ms points at the server, the database or an over-eager plugin rather than at anything in the front end, and no amount of image optimisation will fix it.
What this cannot measure is what happens after the browser starts rendering — layout shifts, main-thread blocking, interaction delay. Those need a real browser. If you add a free PageSpeed Insights API key in the configuration file, the tool will also pull Google's lab and field Core Web Vitals data so both halves appear in one report.
Common questions
Why is my time-to-first-byte slow even on a fast connection?
TTFB reflects server and database response time before any content is sent, not your network. Anything above roughly 600ms usually points at server-side processing, not the front end.
Does this measure Core Web Vitals like LCP and CLS?
Only if you add a free Google PageSpeed Insights API key in the site configuration. Without one, the tool reports what a server-side request can see: timing, size, compression and cache headers.
Will fixing everything here guarantee a fast-feeling site?
No — this covers server response and transfer, which is half the picture. Rendering speed, layout shifts and interactivity happen in the browser and need a real device or lab test to measure.