Free website speed test

Free website speed test with TTFB and page size

Check how quickly a page responds from the server, how long it takes to download, and whether the response is light enough.

Website speed test

Website speed test FAQ

What does this website speed test measure?

It fetches a URL from the server and reports time to first byte, total download time, response size, HTTP status, and a simple performance grade.

Is the speed test the same as Core Web Vitals?

No. This tool measures server fetch timing and HTML response weight. Core Web Vitals also include browser rendering, layout shift, and interaction metrics.

Why does script size matter for analytics?

Large analytics scripts can slow pages and reduce conversion rates. DataFast uses a tiny tracking script to keep analytics from hurting page speed.

Turn campaign clicks into revenue answers

DataFast shows which channels, pages, and campaigns bring paying customers, not just anonymous traffic.