Your system information

• Steam client version (build number or date): 1741737356
• Distribution (e.g. Ubuntu): Bazzite
• Opted into Steam client beta?: [No]
• Have you checked for system updates?: [Yes]
• Steam Logs:

steam-logs.tar.gz

• GPU: 7900 GRE

Please describe your issue in as much detail as possible:

when running a game in the Steam gamescope session steam uses about 30% to sometimes up to 60% CPU usage according to btop and top. when steam is run in a nested gamescope session with gamescope -e -- bazzite-steam

it only uses about 10%

and using Steam without gamescope slightly lower usage around about 8%

tested with the following games

1. Sonic Frontiers
2. kena
3. trails through daybreak
4. a hat in time

Steps for reproducing this issue:

1. Launch Steam in a game scope embedded session
2. run any game (I only tested above 4 but it doesn't seem to be game specific)
3. ssh into the system with another computer or phone
4. run btop or a similar system monitor
5. notice Steam high CPU usage.

EDIT: disabling background recording reduces the CPU usage to under 1 %