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Firefox became slow on various PCs

  • 2 replies
  • 0 have this problem
  • 16 views
  • Last reply by cor-el

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Hey All,

I'm an old user of Firefox since the Netscape times. For the last few weeks, Firefox become so slow on all my computers.

I have 2GBps internet connection and

  • a fast PC (i9 11900/64GB/NVMe SSD RAID/3080Ti, Win 11 for Workstations, wired Ethernet@2.5GBps)
  • a once-it-was-fast notebook (i7 8750H+32GB+NVMe SSD, 1660 GTX, Win 11 Pro, wifi 802.11ax >800MBps)
  • and a relatively slow notebook (Ryzen 3 2300 or the like, 4GB, Win 10 x64, wifi 802.11n).
  • All of them have the latest op system, drivers, firmware, etc.

A common scenario:

  • I try to open a webpage in Firefox, nothing happens;
  • I switch to Chrome (or Opera, Edge), open the same page, it opens in 1-2s;
  • I switch back to Firefox that is still at the middle of loading the page;

I can play it on all the 3 equipment, the result is the same: Ff is much slower than any other browser on my PCs.

There is one common app that is present on all the machines: my paid-for security package that I won't turn off. If Firefox has any problem with it (that Chrome, Opera and Edge don't have), Ff must go (with my regrets).

I tried to turn off all the plugins but it didn't help. I don't think it's plugin related as Ff is still so slow w/o any plugin enabled.

If you could give me a hint where to look for the cause that would be great.

Thanks.

Hey All, I'm an old user of Firefox since the Netscape times. For the last few weeks, Firefox become so slow on all my computers. I have 2GBps internet connection and * a fast PC (i9 11900/64GB/NVMe SSD RAID/3080Ti, Win 11 for Workstations, wired Ethernet@2.5GBps) * a once-it-was-fast notebook (i7 8750H+32GB+NVMe SSD, 1660 GTX, Win 11 Pro, wifi 802.11ax >800MBps) * and a relatively slow notebook (Ryzen 3 2300 or the like, 4GB, Win 10 x64, wifi 802.11n). * All of them have the latest op system, drivers, firmware, etc. A common scenario: * I try to open a webpage in Firefox, nothing happens; * I switch to Chrome (or Opera, Edge), open the same page, it opens in 1-2s; * I switch back to Firefox that is still at the middle of loading the page; I can play it on all the 3 equipment, the result is the same: Ff is much slower than any other browser on my PCs. There is one common app that is present on all the machines: my paid-for security package that I won't turn off. If Firefox has any problem with it (that Chrome, Opera and Edge don't have), Ff must go (with my regrets). I tried to turn off all the plugins but it didn't help. I don't think it's plugin related as Ff is still so slow w/o any plugin enabled. If you could give me a hint where to look for the cause that would be great. Thanks.

All Replies (2)

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Try to go to about:profiles, create a new profile and test it there.

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We have seen reports from Firefox 113 users that Malwarebytes Browser Guard is causing slowness issues, so if you use this extension best is to contact its Malwarebytes for support.

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

  • switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window