"Frame time" degrade after some time

[VeilSilence]

Greetings.

• Nvidia rtx 3090.
• Driver version 555.52.04. It also happened on 550 driver.
• Kernel: Linux Nix 6.9.3-xanmod1
• KDE 6.0.5 wayland session.
• NixOS 24.11, but this problem was on Arch Linux also for me.
• Gamescope commit 09cb7b4

After some time playing, my game performance drops drastically.Here mangohud Baldur's gate 3 logs for example:
https://flightlessmango.com/games/27057/logs/5383

I noticed that when it happens, GPU utilization also drops from 97% to around 60%. This occurs in any game for me.
Game running from KDE itself don't have such issue.

[Joshie]

Try adding LD_PRELOAD="" before the gamescope command.

[VeilSilence]

LD_PRELOAD="" gamescope -w 2560 -h 1440 --mangoapp %command%
I'll test again BG3.

[VeilSilence]

Hmm 52 minutes and no performance regression. Maybe gamemoderun cause the issue. I'm gonna test with gamemoderun now

[kisak-valve]

Thanks @VeilSilence, that makes this the same issue as #1292. Closing as a duplicate.