without astralreprojection, the home is very very jittery/stuttery. I don't know how to describe it (and almost forgot how it looked like, but the difference was clear in Home from SteamVR)
With enabled, things become as smooth as on Windows. Experienced it in Home, Beat Saber (Kind of), Bonelabs and Ancient Dungeon VR.
Games like Half life Alyx and DeepStates [VR] seem to have a too low FPS which makes it very jittery. Seems like Proton isn't that well for these games. Deepstates [VR] has like 150FPs on Windows 10 LTS and on Linux it has like 45 to 55 FPS.
I remember someone on reddit mentioning that the Hz of the VR should be set to 60 or smth, so low FPS isn't noticable. I think it was about SteamVR switching the Hz down and up to adjust to the FPS, which looks like more lag because it bounces a lot.