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Virtualization is still quite slow compared to running natively, especially for things like games.

Well, "quite slow" is of course subjective. But compared to 10+ years ago standards it's barely noticeable today. It seems to be mostly an issue with GPU virtualization. So if you plan your hardware and set it up right (pci passthrough) you can get very good performance, even in a VM. To see it (over)done, check out Linus Tech Tips

2 Gaming Rigs, 1 Tower - Virtualized Gaming Build Log https://www.youtube.com/watch?v=LuJYMCbIbPk

7 Gamers 1 CPU is back! But does it ACTUALLY work!? https://www.youtube.com/watch?v=opX-AsJ5Uy8

If I understood the video correctly that was a dual-socket Xeon system, though, and there was considerable stuttering visible from time to time even if average framerates were decent.

https://www.youtube.com/watch?v=37D2bRsthfI

I read the Reddit post; that looks easier to set up than I thought. I might give it a try some day. But I don't mind rebooting to switch OS anyway (10s boot times plus fast legacy BIOS).

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