The game is not working as a native linux game anymore. It used to be, but now (probably after the last update) it's starting extremely sluggish and randomly crashes. You have to wait 4-8 secs after click on a button, geomap lags 2-5 secs to highlight the continents and so on.
The hw is more than enough (i7, RTX2060, 16GB) and if I force the compatibility tools in steam (proton) it works fine. So it seems something is badly messed up in the native implementation. :-(