this post was submitted on 04 May 2024

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Why are cosmic apps so slow to load? (lemmy.ca)

submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/pop_os

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My laptop is running modern hardware with NVME drive and has 64GB of RAM. Running Pop!_OS 22.04 with Gnome/Wayland.

When I launch the cosmic-store or cosmic-edit (for example) via command line or launcher, each takes about 25 seconds for its app window to load. Loading the Pop Shop in the same fashion takes less than 1 second.

I saw a few lines indicating files couldn't be opened, and thought at first maybe my ulimit was set incorrectly, but there is plenty of headroom on my user (soft limit: 4096, hard limit: 1048576).

I do see a handful of logs that look questionable:

May 04 07:50:59 rosie systemd[2109]: app-gnome-com.system76.CosmicEdit-17126.scope: Couldn't move process 17126 to requested cgroup '/user.slice/user-1000.slice/[email protected]/app.slice/app-gnome-com.system76.CosmicEdit-17126.scope': No such process
May 04 07:50:59 rosie systemd[2109]: app-gnome-com.system76.CosmicEdit-17126.scope: Failed to add PIDs to scope's control group: No such process
May 04 07:50:59 rosie systemd[2109]: app-gnome-com.system76.CosmicEdit-17126.scope: Failed with result 'resources'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ The unit UNIT has entered the 'failed' state with result 'resources'.
May 04 07:50:59 rosie systemd[2109]: Failed to start Application launched by gnome-shell.

What could be causing the cosmic apps to load so slowly?

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[–] mmstick 2 points 7 months ago* (last edited 7 months ago) (2 children)

Every application launches within 0.2 seconds for me. Maybe you need to play around with env WGPU_POWER_PREF=high

[–] [email protected] 1 points 6 months ago* (last edited 6 months ago) (1 children)

Ok, I've narrowed down the cause of slowdown slightly. It is when my laptop is on battery only that load time takes about 25 seconds. When plugged in (mains power), load time is < 1sec.

The only change I see in journalctl -xef when switching between battery/mains power is as follows (first line battery, second line mains):

May 22 23:45:35 rosie kernel: Dynamic Preempt: voluntary
May 22 23:45:54 rosie kernel: Dynamic Preempt: full

Edit: I can also simulate the effect via sudo tlp ac (fast load time) and sudo tlp bat (slow load time).

[–] mmstick 1 points 6 months ago (1 children)

That's very strange. Did you update today?

[–] [email protected] 1 points 6 months ago (1 children)

No, I haven't updated packages in 3 or 4 weeks.

[–] mmstick 2 points 6 months ago (1 children)

This may be fixed now, but at the same time, I'd wait a day before updating cosmic-comp because xwayland's currently broken while we need to update xwayland to the latest version for explicit sync support.

[–] [email protected] 1 points 6 months ago

FYI this is still an issue for me. Updated to cosmic-edit 0.1.0~1715990347~22.04~f5238e1.

[–] [email protected] 0 points 7 months ago (1 children)

Thanks. Strangely, after using WGPU_POWER_PREF=high, it is always fast for me, even when I don't specify this preference. I don't understand it. In any case, I guess it's "fixed" for now, so thanks!

[–] [email protected] 1 points 6 months ago* (last edited 6 months ago)

I no longer think WGPU_POWER_PREF has any bearing on the fast/slow issue, see my other comment.