Does to hard drive limitations in space might not be able to run Windows 10 on an iPad or Macbook Pro.
Staying with the same instruction set (e.g. x86 -> x86) does help with performance though.
There’s a discussion of this here: https://stackoverflow.com/questions/5806589/why-does-intel-h...
It’s slow because it’s emulating, period. CISC/RISC has little to do with it.