This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox slow and choppy for no discernable reason

  • 1 cavab
  • 1 has this problem
  • 15 views
  • Last reply by FredMcD

more options

Using Firefox 79.0 on Windows 7 (I know, I'm migrating soon) and I'm running into the problem of Firefox being slow to respond and "hanging" for about ten seconds. Resource Monitor indicates that Firefox is using ~60% of physical memory despite only having 12 tabs (10 of them pinned) open. I have 13 extensions installed but the majority of them aren't in regular use. I have 36G of RAM installed.

This seems to start happening if Firefox has been open for a while, even if it isn't being used. I've even started using OneTap to dump saved tabs down and reduce the load but this doesn't seem to help. Closing Firefox down entirely and re-opening it does fix it for a time but it becomes a problem again after not too much longer.

Would appreciate some input.

Using Firefox 79.0 on Windows 7 (I know, I'm migrating soon) and I'm running into the problem of Firefox being slow to respond and "hanging" for about ten seconds. Resource Monitor indicates that Firefox is using ~60% of physical memory despite only having 12 tabs (10 of them pinned) open. I have 13 extensions installed but the majority of them aren't in regular use. I have 36G of RAM installed. This seems to start happening if Firefox has been open for a while, even if it isn't being used. I've even started using OneTap to dump saved tabs down and reduce the load but this doesn't seem to help. Closing Firefox down entirely and re-opening it does fix it for a time but it becomes a problem again after not too much longer. Would appreciate some input.

All Replies (1)

more options

https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

https://support.mozilla.org/en-US/kb/firefox-takes-long-time-start-up

https://support.mozilla.org/en-US/kb/quick-fixes-if-your-firefox-slows-down


MemTest LAST UPDATED : 27/09/2013 Could you please run a tool from http://memtest.org/ in order to check the integrity of your RAM?

You will need a thumb or disk drive to install it on.


Do you let Windows handle the page file or did you set a fixed size ? If you use a fixed size for the page file then try the former and let Windows handle the page file.