RemixOS would work best if you booted it from a usb stick on the compute
I can confirm. In fact, i would recommend you install it on a partition.
I was never able to run any virtualisation solutions at decent speed.
The only one that worked, QEMU, has slow graphics and Android-x86/RemixOS still do not support Virgil3D.
Anbox requires systemd and it's still is a proof-of-concept.
Android-x86 when installed on a real PC, is really smooth.
Even using the Intel integrated graphics, it will mostly likely run over a lot of phones in terms of power.
AMD GPUs work best with Android-x86 as the Mesa drivers are supported.
Would it run well on a first gen i7 PC with 8 GB of RAM?
Absolutely, but not through a VM.