Significant performance reduction after R3.2 -> R4.0 upgrade

[kravietz]

Qubes OS version:

R4.0

Affected component(s):

All applications, most notably Chrome, Firefox

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Steps to reproduce the behavior:

After R3.2 -> R4.0 upgrade the performance of all GUI apps was significantly reduced. This is most visible with Chrome and Firefox, but applies to any GUI application.

Expected behavior:

In R3.2 applications were responding immediately with no visible delay. I installed R4.0 over fully upgraded R3.2 just a few days ago. Unfortunately I'm unable to provide benchmarks for R3.2 as it's my primary working computer and downgrade is not feasible.

Actual behavior:

Responsiveness of the applications dropped dramatically to a point where you actually wait for a fraction of second for application to respond to a mouse click etc. Video playback is practically impossible, they are being displayed frame-by-frame, like a slow GIF animation.

General notes:

Kernel messages attached

dmesg.txt

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Related issues:

[andrewdavidwong]

Duplicate of #3639

[andrewdavidwong]

Duplicate of #3639

[andrewdavidwong]

This appears to be a duplicate of an existing issue. If you believe this is not really a duplicate, please leave a comment briefly explaining why. We'll be happy to take another look and, if appropriate, reopen this issue. Thank you.

[andrewdavidwong]

This appears to be a duplicate of an existing issue. If you believe this is not really a duplicate, please leave a comment briefly explaining why. We'll be happy to take another look and, if appropriate, reopen this issue. Thank you.