emulating x86 on ARM with any kind of real preformanceis additionally tricky because the x86 archetechure has very strong memory gaurentees (dosent matter if memory is aligned, dosent matter when in the instruction pipeline you access it, etc) that ARM isnt even close to matching.

Emulating that requires a massive performance hit, because you essentially have to check every single memory access to make sure its not doing something invalid on ARM.