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So here is the thing. I have many browsers on my computer, however only Firefox takes a while to load any request. Let me enphasize this: ANY REQUEST !
Including loading Javascript files and CSS files. It takes half a minute to load some websites.

I tried deinstalling and reinstalling firefox, removing all extensions, cleaning up the AppData files from firefox, but still the same.
OS is Windows 10, Firefox Version is the last (and has been upgraded a few times since the problem appeared without solving it)

Here is an example with Github.com, but i get similar results everywhere :

Firefox 3~10s Firefox takes 3,8s to load github Sometime it takes even up to 10 seconds. Firefox Takes 10s to load github And here are the latest useful ressource loaded, I need 15 seconds to load the full page (and only 2.5s on Chrome). enter image description here

Chrome ~1.6s Chrome takes 1,6s to load github

Brave ~ 1.9s Brave takes 1,9s to load github

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    I would temporarily suspend your AV protection and see if that prevents the performance degradation
    – Ramhound
    Commented Jul 15, 2022 at 13:09
  • Disable all your extensions in Firefox, to test if one of them is the problem.
    – harrymc
    Commented Jul 15, 2022 at 17:41
  • @harrymc that was my first thought too, but he did mention "removing all extensions" :)
    – MiG
    Commented Jul 15, 2022 at 17:49

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