OSX VMs are so slowwww in a virtual environment though. I’ve tried doing it several times in parallels and they just crawl. Unless I’m doing something wrong.
My experience and knowledge about it has said that this is because of the reliance of OSX on GPU hardware. That means it won't ever perform well on any kind of software rendering. Some kind of GPU passthrough or sharing is needed to make it work acceptably.
It's got to be more complicated than that. I've used Parallels to run complex DX10 games such as a Tomb Raider 2013. I'm not sure what wizardry they use to make that happen, but it works really well.
Parallels is, perhaps not coincidentally, not as terrible at running macOS as some other solutions, but it's still fairly poor.
It's not. I've run macOS under a hypervisor with GPU passthrough and it's essentially as fast as on metal (I think you can see a single digit percentage difference in benchmarks). I don't think anyone has a soft 3D driver though for macOS guests. Parallels and VMware have both put a lot of work into getting some level of soft VM based 3D acceleration working for Windows guests, presumably because that's where the demand is. At the same time macOS has been built heavily around GPU for everything for a very long time now, initially as a way to improve even basic interface smoothness in Aqua back in the day. So it's a dog in pure software on a VM. It really needs a GPU.
FWIW, in the past VMware did officially have Mac Pros on the hardware compatibility list for ESXi (up to 5.5 I think? maybe the trashcan lasted longer). And that in turn would be legit for running a Mac guest. I've read you can sort of get it to work on other Macs like the Mini, though secure boot must be disabled and the T2 causes other issues. Otherwise you need to patch it, or go with KVM or some other alternative.
