Performance Timing

Website Speed Checker

Measure DNS lookup, TCP connect, TLS handshake, and time to first byte (TTFB) from our server.

Try:

Related Tools

⊙
Website Status Checker

Check if a website is up or down right now. Tests from our server independently of your connection — instant, free.

⊛
SSL Certificate Checker

Check any website's SSL certificate: expiry date, issuer, domain coverage, chain validity. Instant, free.

⊞
HTTP Headers Lookup

Inspect the HTTP response headers returned by any URL. Check cache-control, CORS, redirects, security headers, and more.

Website Speed — What Each Timing Means

Server response time is measured from our server, not your browser. This isolates server-side performance from client-side factors (browser rendering, JavaScript execution, image loading). Results represent raw HTTP performance — the foundation of all page speed.

DNS Lookup

Time to resolve the domain to an IP address. Typically <10ms with a good DNS provider. High DNS time (>100ms) can be fixed by switching to a faster DNS provider or enabling DNS caching.

TCP Connect

Time to establish a TCP connection with the server. Highly dependent on geographic distance — a server in London will have a higher connect time from a user in Sydney than from Europe. A CDN with edge servers closer to users reduces this significantly.

TLS Handshake

Time to complete the TLS/SSL handshake for HTTPS connections. Modern TLS 1.3 is faster than TLS 1.2, especially for repeat visitors with session resumption. Typically 20–200ms.

Time to First Byte (TTFB)

TTFB is the most important server-side metric — it measures server processing time after the connection is established. Slow TTFB usually indicates slow database queries, no page caching, or inadequate server resources. Target <200ms for good Core Web Vitals scores.