Hello @Tropingenie, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/6458#issuecomment-2197854239.
As a side note, "Proton version: Default" isn't a thing, at some point you selected a global default compatibility tool in Steam's settings.
As a side note, "Proton version: Default" isn't a thing, at some point you selected a global default compatibility tool in Steam's settings.
My bad, it's one of those set and forget kind of menus. Will update with a comment.
And apologies for making a duplicate issue, misunderstood how the system went and incorrectly ticked a box :(
Compatibility Report
System Information
I confirm:
Symptoms
Memory leak. Observed process was using ~8GB after an hour of gameplay, and upwards of 18GB after two.
Reproduction
steam-1422130.log