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Firefox on Linux is even slower with version 40

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I was waiting for version 40 to fix the slowness issues on Linux thanks to the "off main thread compositing" but it actually is even slower :(

My machine is an 8 cores CPU with 16GB of RAM and an average GPU (with open source radeon drivers). I did try "Repare Firefox" in about:support but it changes nothing.

Examples of slowness:

  • When playing a video on youtube (HTML5, not Flash), I can have up to half a second of delay between image and sound and something like 5fps.
  • When scrolling on Google+, it's so slow, I don't even see the smooth scrolling.

In the previous version, it was already kind of slow, but here it's yet another level. Of course I did try with Chrome and both the cases above were working flawlessly.

Regards, Creak

Chosen solution

I apparently fixed part of the problem by force enabling "offmainthreadcomposition":

In about:config, enable:

  • layers.offmainthreadcomposition.async-animations
  • layers.offmainthreadcomposition.enabled

I also installed quite everything related to vdpau and vaapi (already had some of the packages installed).

It's better, but not the best. Considering the machine it's running on, it should really not have any stuttering at all. I hope e10s will improve this situation.

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Chosen Solution

I apparently fixed part of the problem by force enabling "offmainthreadcomposition":

In about:config, enable:

  • layers.offmainthreadcomposition.async-animations
  • layers.offmainthreadcomposition.enabled

I also installed quite everything related to vdpau and vaapi (already had some of the packages installed).

It's better, but not the best. Considering the machine it's running on, it should really not have any stuttering at all. I hope e10s will improve this situation.