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TTFB vs cache

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I wonder why Firefox is so slow when a site is present in it's cache.

It's been the same problem for years, whenever I'm getting a long TTFB from the server, let's say a TTFB of a second or two, I know that clearing Firefox's cache of that site will resolve the issue and bring down the TTFB to it's normal of around 100ms.

Why and how clearing the cache changes the server TTFB?

Thank you.

-- Francois

Danga war a dugg ci sam sàq ngir tontu ci siiwal. Kon tàmbalil laaj bu bees, sudee amagoo am sàq.