Here's a little something, not specifically related to VR, but can be used with your VR apps aswel.
If you have both an onboard GPU in your CPU and a discrete Graphics card, Windows has added a small tool to let you select which apps use which GPU. This does not mean the codec used during playback is locked to that GPU however! But it can help with overall performance.
You can select which GPU is used to render certain apps. Sadly Microsoft didn't think to add support for 3 or more graphic cards, ie I have A system with 13 GPU's.

How to find this tool/setting:
- Right click on the start/windows button and select Settings.
- Click on System. Should be the first icon.
- in the Display tab scroll all the way down until you find Graphics settings and click it.
- Here you can add Microsoft apps (those that come installed with Windows or are downloaded from the Microsoft store.) and 'Desktop apps' (everything else)
If you have a hard time locating an app/program on your system, I recommend downloading a small but powerfull tool 'Search Everything' from voidtools . com ; Easy to use, hard to master 🙂 Looks simple but it can do pretty impressive stuff. ie, wonder if you have duplicate VR video's or funscripts? Or can't find that funscript that goes with a video? type in the search namepartdupe:ext:mp4|funscript