WordPress speed test & TTFB checker
Measure Time to First Byte, see exactly how much JavaScript, CSS and imagery a page ships, and check Gzip and Brotli compression.
Free tools check one site, once. SITEOPS protects all client sites, 24/7.
Connect your agency portfolio to run automated safe updates with visual regression verification, 5-minute uptime alerts, and white-label client reports.
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Frequently asked questions
What is Time to First Byte (TTFB) and why is it critical?↓
TTFB measures how long a browser waits between requesting a page and receiving the first byte of data from the server. A fast TTFB (< 250ms) proves that your WordPress hosting, server CPU, and page caching are working efficiently. A slow TTFB (> 600ms) is usually caused by lack of caching, slow database queries, or unoptimized PHP execution.
How does Brotli or Gzip compression improve WordPress speed?↓
Compression algorithms like Gzip and Brotli compress HTML, CSS, and JS text files on the fly before sending them over the wire. Brotli is 15–20% smaller than Gzip and reduces bandwidth usage and page load time substantially.
What should I fix first if my WordPress site is slow?↓
First, enable full page caching (using Redis or a plugin like WP Rocket/LiteSpeed). Second, compress images to WebP/AVIF format. Third, defer or eliminate unused JavaScript and CSS files.
Is this lab speed test identical to Google Core Web Vitals?↓
This tool performs a high-precision outside-in server latency and payload audit. Google Core Web Vitals aggregates field telemetry from real Chrome visitors over a 28-day window. SITEOPS tracks both in your continuous agency dashboard.