description CDNPerf Overview
CDNPerf is a tool developed by WebPageTest that measures the performance of websites when accessed through various Content Delivery Networks (CDNs), specifically focusing on metrics like First Byte Time and Largest Contentful Paint to assess CDN impact.
help CDNPerf FAQ
What does CDNPerf measure when comparing CDNs?
CDNPerf compares how quickly content is delivered through different content delivery networks, with metrics such as First Byte Time and Largest Contentful Paint. Those measurements show both server-response speed and the effect on a visible page element.
Can CDNPerf compare Cloudflare with other CDNs?
CDNPerf is intended for comparing CDN providers, so services such as Cloudflare can be evaluated alongside other available networks. The result depends on the tested location, asset, route, cache state, and time of measurement.
Why is First Byte Time important in a CDN comparison?
First Byte Time measures how long the browser waits before receiving the first response byte. A slow result can point to origin delay, routing distance, or a cache miss even when later file transfer is fast.
Is a CDN with the fastest LCP always the best choice?
Not necessarily, because Largest Contentful Paint can also be affected by HTML, images, fonts, and page code. CDNPerf is best used as one part of a decision that also considers coverage, cache behavior, features, and cost.
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