[Bug 1817620] Re: High cpu usage on alt-tab-ing

[Expired for mutter (Ubuntu) because there has been no activity for 60 days.] ** Changed in: mutter (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu.

[Bug 1817620] Re: High cpu usage on alt-tab-ing

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.] ** Changed in: gnome-shell (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu.

[Bug 1817620] Re: High cpu usage on alt-tab-ing

Please try: (1) Updating your system, since the fix mentioned in comment #1 should now be included in 18.04 updates. Maybe this bug has been fixed. (2) If you do restart gnome-shell and find that improves performance, then wait another 30 seconds or more and retest. Does it get slower again

[Bug 1817620] Re: High cpu usage on alt-tab-ing

** Changed in: gnome-shell (Ubuntu) Importance: Undecided => Low ** Changed in: mutter (Ubuntu) Importance: Undecided => Low -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu.

[Bug 1817620] Re: High cpu usage on alt-tab-ing

** Changed in: gnome-shell (Ubuntu) Status: Expired => New ** Changed in: mutter (Ubuntu) Status: Expired => New -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1817620

[Bug 1817620] Re: High cpu usage on alt-tab-ing

[Expired for mutter (Ubuntu) because there has been no activity for 60 days.] ** Changed in: mutter (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.

[Bug 1817620] Re: High cpu usage on alt-tab-ing

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.] ** Changed in: gnome-shell (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.

[Bug 1817620] Re: High cpu usage on alt-tab-ing

OK, removed. Just found it weird that both issues disappered by restarting `gnome-shell`, so assumed they were related by some root cause. Thank you. ** Description changed: Switching between apps was feeling extremely laggy and unsmooth after some days of keeping the laptop on and just

[Bug 1817620] Re: High cpu usage on alt-tab-ing

I think this bug is very clear already. It really requires someone (most likely future me) to do some profiling on the primary test case: > just alt-tab-ing between apps would keep the cpu consistently at 100% when hitting it more than 8-9 times per second and *not* letting go of Alt (meaning I

[Bug 1817620] Re: High cpu usage on alt-tab-ing

Thanks for the reply. I'll run Apport as soon as I can access the machine again. Regarding the actual issue, I don't think it is as cut and dry as this being just about rendering alone, as that would imply that the rendering performance was consistently bad. As I wrote, the performance seems fine

[Bug 1817620] Re: High cpu usage on alt-tab-ing

Performance of window previews is significantly improved in mutter 3.28.4 (which doesn't exist yet :) due to: https://gitlab.gnome.org/GNOME/mutter/commit/d81dcd13e4e14a8c80b7c9d475feb58c258babc0 But I think 18.04 will get that fix soon as part of the proposed update:

[Bug 1817620] Re: High cpu usage on alt-tab-ing

Also, please run this command to send us more information about the affected machine: apport-collect 1817620 ** Also affects: mutter (Ubuntu) Importance: Undecided Status: New ** Changed in: mutter (Ubuntu) Status: New => Incomplete -- You received this bug notification

[Bug 1817620] Re: High cpu usage on alt-tab-ing

** Tags added: bionic performance -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1817620 Title: High cpu usage on alt-tab-ing To manage notifications about this bug go to: