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.

Avatar for Username

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

This thread was archived. Əgər kömək lazımdırsa lütfən yeni sual verin.

Firefox in safe mode is fast, outside safe mode with all extensions and acceleration disabled is slow

  • 4 cavab
  • 1 has this problem
  • 1 view
  • Last reply by Photon44

Photon44
Photon44
more options

Ironically this seems to have started when I was showing off Firefox to co-workers who are Chrome users.

I've noticed Firefox become very slow especially in GMail. In Firefox's performance profiler it reveals that the majority of the slow times (ie. 1798 ms out of 2971 ms) is spent in JIT (see screenshot).

I tried disabling all extensions, updated my graphics driver to the latest version (Intel HD Graphics 4000 10.18.10.5059), and then disabled hardware acceleration. Nothing sped it up.

However, if I start Firefox in its safe mode it's fast with snappy responsiveness, even in GMail. I've run out of diagnosing ideas.

Ironically this seems to have started when I was showing off Firefox to co-workers who are Chrome users. I've noticed Firefox become very slow especially in GMail. In Firefox's performance profiler it reveals that the majority of the slow times (ie. 1798 ms out of 2971 ms) is spent in JIT (see screenshot). I tried disabling all extensions, updated my graphics driver to the latest version (Intel HD Graphics 4000 10.18.10.5059), and then disabled hardware acceleration. Nothing sped it up. However, if I start Firefox in its safe mode it's fast with snappy responsiveness, even in GMail. I've run out of diagnosing ideas.
Attached screenshots

All Replies (4)

Wesley Branton
Wesley Branton
more options

If you are having issues with the performance of Firefox, you can try refreshing Firefox. Similar to Safe Mode, this will revert certain settings and remove any downloaded extensions, while preserving personal data (boomarks, passwords, etc).

Photon44
Photon44 Question owner
more options

I refreshed now but there's no improvement.

Wesley Branton
Wesley Branton
more options

If you are using the 64-bit version of Firefox, try switching to the 32-bit version to see if that improves anything. If you are running the 32-bit version, try changing the to the 64-bit of Firefox (if your system is compatible).

Photon44
Photon44 Question owner
more options

I'm running the 64-bit version so I installed 32-bit and it was just as slow. I uninstalled 32-bit and re-installed 64-bit and still no improvement.