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. Please ask a new question if you need help.

Firefox 34 is slow even after reset

  • 2 replies
  • 1 has this problem
  • 1 view
  • Last reply by mlurker

mlurker
mlurker
more options

I recently got an update for my Firefox and after that it has become very slow!

What I tried to do: - updated all plugins - disabled all addons - ran Firefox in a safe mode - created a new fresh profile - updated video driver, turned on/off hardware acceleration - changed option layers.offmainthreadcomposition.enabled to "false"

It's still slow! As of now, I have a brand new profile without any addons and about 10 tabs opened. There is a noticeable lags when I switch between tabs, open new ones, scroll, and navigate through Firefox menus.

Firefox, what's wrong with you? How to make you work right at it was on version 3.x?

Some details: I have a dell e6430 laptop, core i5 CPU, 16 GB RAM, 128 SSD, lots of free RAM, almost nothing running in background and consumes CPU.

I recently got an update for my Firefox and after that it has become very slow! What I tried to do: - updated all plugins - disabled all addons - ran Firefox in a safe mode - created a new fresh profile - updated video driver, turned on/off hardware acceleration - changed option layers.offmainthreadcomposition.enabled to "false" It's still slow! As of now, I have a brand new profile without any addons and about 10 tabs opened. There is a noticeable lags when I switch between tabs, open new ones, scroll, and navigate through Firefox menus. Firefox, what's wrong with you? How to make you work right at it was on version 3.x? Some details: I have a dell e6430 laptop, core i5 CPU, 16 GB RAM, 128 SSD, lots of free RAM, almost nothing running in background and consumes CPU.

Modified by mlurker

All Replies (2)

kuopiofi
kuopiofi
more options

Have you checked how much CPU FF takes? That's why latest versions are so slow for me.

I also noticed that FF has been having problems with multiple tabs/windows since 32.03, which is the version I've gone back every time...

mlurker
mlurker Question owner
more options

When I do nothing with Firefox, it consumes 3-5% CPU.