TTFB
High first-byte time often points to backend, database, cache, proxy, load or network problems.
Tool
PageSpeed checker
Runs a lightweight web performance audit: HTTP status, TTFB, HTML size, cache, compression, viewport and resource count.
Website performance
PageSpeed checker: TTFB, cache, compression and page resources
The DataHouse PageSpeed checker performs a lightweight technical audit: HTTP status, HTML response time, document size, cache headers, compression, viewport and resource counts.
Cache and compression
Cache-Control and Content-Encoding show whether the server sends basic performance signals.
Resources and mobile
Many scripts, stylesheets or images slow rendering; missing viewport suggests mobile problems.
When should PageSpeed be checked?
- After migrating a website, CMS, shop or application to a new server.
- After enabling cache, CDN, reverse proxy, gzip/Brotli or image optimization.
- When TTFB is slow or HTTP 4xx/5xx errors appear.
- After deploying a new template, widget or external script.
- As a quick follow-up to SSL and mixed content checks.
How to use the result
The result does not replace Lighthouse or Core Web Vitals, but it quickly highlights server-side and HTML-level problems worth checking first.
FAQ: PageSpeed checker
Does this PageSpeed checker replace Lighthouse?
No. It is a lightweight technical test for HTTP status, TTFB, HTML size, cache, compression, viewport and resource count. Lighthouse and Core Web Vitals are the next deeper step.
What does high TTFB usually mean?
High TTFB often means the server or backend takes too long to generate the first HTML response because of cache, database, proxy, load or network issues.