>>402249378
Sort of. Steam VR (pre OpenXR) is poorly optimised for Oculus. The performance overhead varies and in some cases it seems to be very low (HL Alyx for example) whereas in others it's ~10% (ITTR). There has been a lot of detailed benchmarking and the general consensus is that SteamVR is a 10% overhead for unoptimised titles with using Oculus. Going the other way with Reverb is noticeably less, interestingly.

There's also a performance overhead due to encoding for the Q2, this seems to be 3-5% depending on settings.

If you're seriously performance strapped your best bet is to use Virtual Desktop and play wirelessly, it handles SteamVR natively and is more efficient in encoding than Airlink, so you can get equivalent performance then.

>>402258737
PSVR 1 was easily made compatible (with a webcam for the wands). I wouldn't be surprised honestly. I wouldn't even be surprised if Sony provide some official compatibility or a PSVR2.5 that has PC compatibility. But unless they're doing something very funky I guarantee we'll get modded support.