Free Tool
Website Speed Test
Test any site from multiple regions at once. See DNS, TCP, TLS, and time-to-first-byte broken out per region, so you know exactly where the time goes. No signup needed.
How it works
Three steps, no signup.
No cached numbers. Every test hits the URL you name live from our monitoring regions, the moment you ask.
Enter any URL
Type a URL and run the test. We request it live from our monitoring network rather than loading it in a browser or reading cached numbers.
We measure from every region at once
Multiple monitoring regions request your site in parallel, so you see the real spread of response times across locations, not just one vantage point.
See where the time goes
Each region breaks its response into DNS, TCP, TLS, and time-to-first-byte, so you can tell which phase is slow and how speed varies by location.
Why test website speed from multiple regions?
A test from one location only tells you how fast your site is from that one place. Your visitors are spread around the world, and DNS resolution, routing, and CDN behavior all vary by geography. Testing from several regions at once shows you the real spread of experiences, including a region that is slow or unreachable while the others look fine.
What do DNS, TCP, TLS, and TTFB mean?
They are the four phases of a request. DNS is looking up your domain's IP address, TCP is opening the network connection, TLS is negotiating the encrypted handshake, and TTFB (time to first byte) is how long your server takes to start responding once connected. Seeing them broken out tells you where time is actually going: slow DNS points at your nameservers, slow TTFB points at your application or server.
What is a good TTFB?
Under 200ms is excellent, under 500ms is solid, and under 800ms is acceptable for most sites. Consistently above that, and pages feel sluggish before a single byte of content renders. Google's guidance treats 800ms as the threshold where TTFB starts hurting Core Web Vitals.
How do I track speed continuously instead of spot-checking?
A one-off test is a snapshot. Sentinel runs this same multi-region check on a schedule, records response times over time, and alerts you when a region slows down or your site goes offline. Response-time monitoring is included on the free plan.
Stop checking by hand.
Sentinel watches your uptime, SSL, DNS and domains around the clock from multiple regions, and tells you the moment something needs attention.