Loading times at Start & of savegames very long (both 2 min 5 sec). Only certain resolutions work fullscreen. Otherwise fine.
Fullscreen worked only when in-game resolution was identical to max resolution of the screen used (a laptop display), otherwise weird behavior, pseudo windowed-fullscreen output with buttons located where they would have been if fullscreen resolution would been rendered properly. Problematic, as such old games are usually best experienced in a lower resolution
extremely slow loading times (2 min 5 sec).
Works exceedingly well with no tweaks required.
Scenario loading takes an unusual amount of time. Unknown if it's specific to Linux compatibility or if the same issue is present on Windows, but nevertheless scenarios and saves load a very long time.
Game takes A LOT of time to start scenarios, but after that it seems to work properly.
I did not test it too deeply because I do not know very well how to play it...
the game works well, there is little time to start the game, but a initiation of Launch Configuration Tool of the game is not working without proton but the native game works quietly.