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Cloudflare Developers•3y ago
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The "Prefetch URLs" option should not affect the TTFB of the HTML page. As the name suggests, Cloud

The "Prefetch URLs" option should not affect the TTFB of the HTML page. As the name suggests, Cloudflare will prefetch URLs specified in the Link response header. This means the resources are more likely to already be in Cloudflare's cache when the client requests them, improving the overall loading time of the page. However, "Prefetch URLs" won't do anything if your origin does send the Link header (which many popular CMS do by default). https://developers.cloudflare.com/fundamentals/speed/prefetch-urls/#setup
Prefetch URLs · Cloudflare Fundamentals docs
URL prefetching means that Cloudflare pre-populates the cache with content a visitor is likely to request next. This setting — when combined with additional …
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The "Prefetch URLs" option should not affect the TTFB of the HTML page. As the name suggests, Cloudflare will prefetch URLs specified in the `Link` response header. This means the resources are more likely to already be in Cloudflare's cache when the client requests them, improving the overall loading time of the page. However, "Prefetch URLs" won't do anything if your origin does send the `Link` header (which many popular CMS do by default). https://developers.cloudflare.com/fundamentals/speed/prefetch-urls/#setup - Cloudflare Developers