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

submitted 2 months ago* (last edited 2 months ago) by [email protected] to c/[email protected]

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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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[-] [email protected] 2 points 2 months ago

Very few people will have experience with cosmic apps at this point, it's in alpha state... :)

[-] [email protected] 1 points 2 months ago

Yeah, I get that. I've helped contribute to Pop!_OS in the past and thought I'd give it an early run. I'm just surprised that the packaged apps are so slow. When I ran them 6 months ago, they loaded so quickly I was shocked (<50ms).

I'm not sure if it's my system, or the (new) state of the apps.

[-] [email protected] 1 points 2 months ago* (last edited 2 months ago)

I think it's probably the system. Some kind of bug I guess. I'm really looking forward to cosmic too btw, seems very nice. But I guess it won't replace plasma anytime soon. These things takes time....

[-] [email protected] 2 points 2 months ago* (last edited 2 months ago)

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 1 month ago* (last edited 1 month ago)

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).

[-] [email protected] 1 points 1 month ago

That's very strange. Did you update today?

[-] [email protected] 1 points 1 month ago

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

[-] [email protected] 2 points 1 month ago

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 1 month ago

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

[-] [email protected] 0 points 1 month ago

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 1 month ago* (last edited 1 month ago)

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

this post was submitted on 04 May 2024

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