Under the hood, intel processors emulate a CISC processor with a RISC processor, so there’s nothing fundamentally slow about that.
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...
Does to hard drive limitations in space might not be able to run Windows 10 on an iPad or Macbook Pro.