[Netch]

> QEMU running Windows for x86 on an M1 isn't very fast either.

It seems the main obstacle is in paging where x86 4KB clashes with Apple 16KB (ARM/64 supports multiple sizes), so, 2-level paging canʼt aid and an emulator has to shadow-paging which is, definitely, much slower.

> Apple does it with Rosetta and Microsoft with whatever their thing is called, you don't even notice that an app is running under emulation.

But they still use a vendor-specific TSO support in hardware.