[x] that I haven't found an existing compatibility report for this game.
[x] that I have checked whether there are updates for my system available.
Symptoms
After loading the game past all the disclaimers, it begins to periodically freeze every second. It is very noticeable and makes the game very uncomfortable to play. There seems to be no configuration, where this can be solved (like changing game's settings or adding a proton environment variable). The issue is present on versions of Proton 8 and above. The oldest version the game can run on is Proton 7, where this issue isn't present. It might be related to an error Failed to find library for L"Windows.System.DispatcherQueue", which can be found in the attached log and seems to be printed out often as well.
It can be demonstrated with this graph generated by MangoHud (NOTE: the problem also occurs when not using it).
Reproduction
Go to game's "Properties" >"Compatibility" > "Force use of specific Steam Play compatibility tool" = "Proton 9.0-3"
Open the game, wait for it to load, create a new sandbox save file and play.
Notice periodic freezes every second affecting the graphical output. (Easy to notice when moving around.)
Compatibility Report
System Information
I confirm:
Symptoms
After loading the game past all the disclaimers, it begins to periodically freeze every second. It is very noticeable and makes the game very uncomfortable to play. There seems to be no configuration, where this can be solved (like changing game's settings or adding a proton environment variable). The issue is present on versions of Proton 8 and above. The oldest version the game can run on is Proton 7, where this issue isn't present. It might be related to an error

Failed to find library for L"Windows.System.DispatcherQueue", which can be found in the attached log and seems to be printed out often as well.It can be demonstrated with this graph generated by MangoHud (NOTE: the problem also occurs when not using it).
Reproduction
Log
steam-305620.log