Performance Checker
Measure real TCP connect time, time to first byte (TTFB), and total page load for any domain. Results are compared against industry performance budgets.
What do these metrics mean?
TCP Connect measures how long it takes to establish a network connection to the server. Time to First Byte (TTFB) is the delay between the browser sending a request and receiving the first byte of the response, reflecting server processing speed. Total Load is the full time to download the entire response body.
Why does performance matter for security?
Slow sites are more vulnerable to denial-of-service attacks because each request ties up server resources longer. Poor TTFB can indicate misconfigured servers or missing caching, both of which expand the attack surface. Performance budgets help you catch regressions before they become incidents.
What are good performance budgets?
Industry benchmarks suggest a TCP connect time under 150 ms, TTFB under 600 ms, and a total document load under 3 seconds. These vary by audience location and server infrastructure. A CDN can dramatically reduce connect time and TTFB for geographically distributed users.
FAQ
Frequently asked questions
Is this performance checker free?+
Yes, completely free. No signup or credit card required. Test any public domain instantly.
Where are requests made from?+
Requests are made from our server in Sydney, Australia. Your results reflect latency from this location. Users in other regions may experience different timings.
Why is my TTFB high even though the site loads fast in my browser?+
Your browser caches DNS, keeps connections open, and stores assets locally. This tool measures a cold request from scratch with no caching, which reflects what a first-time visitor or search engine bot experiences.
How can I improve my performance scores?+
Use a CDN to reduce connect time, enable server-side caching and compression (gzip/Brotli) to lower TTFB, and minimize page weight by optimizing images and deferring non-critical scripts to reduce total load time.
Performance Checker is just the start.
CQwerty Shield checks SSL, DMARC, SPF, DNS, HTTP headers, WHOIS, breach intel, and more — with CVE/KEV cross-references on every finding.
Free full scan — no signup →