No [Ocean] Water + prolonged artifacts time when rendering down long range scopes

Rapid frame loss if a high graphics area is loaded too quickly [This is managed if you know the regions well enough to stop and enter on foot into certain renderings] Around the third to fifth use of a warp will cause a forever loading screen, Alt+F4 is effective at working around this.

Prolonged Idling can causes crashes [before protontricks this would brick the entire user session], using beds/seats, certain menus will allow you to AFK safely. Alt Tabbing can also cause you to hit that crash, but I believe it's due to whatever lack of input causes the first crash, not a seperate thing, as using a bed/seat will prevent that crash too.

If you want to do an extended session switch off steam overlay, you can toggle it on briefly if you want to use the store but it does increase the risk of crashes in long plays. After using Warps or loading three regions, restarting the game will help avoid bugs/slow downs.