I'm using an Index.
I also tried using the SteamVR Frame Timing window and it showed that something in the application was slowly and steadily using more CPU over time. The GPU didn't have the same effect. So there is some kind of CPU eating leak, which also uses up a little bit more RAM over time.
When I run VaM in VR the framerate slowly drops until it's unplayable. It does this even on the VR main menu with no scene loaded, but also with a scene loaded. It starts smooth and over a few minutes it gets very laggy. The FPS counter in the settings menu shows this too, it's stable around...