https://wccftech.com/microsoft-prepares-x86-64-support-for-windows-on-arm-devices/

In a report from Neowin, Microsoft is preparing x86-64 software support for Windows on ARM devices. This is quite the change considering Qualcomm's Miguel Nunes claimed back in 2016 that x86-64 software emulation wasn't going to happen.

The potential of x86-64 programs becoming compatible with Windows on ARM machines is high, but due to the microarchitecture of ARM processors, 64-bit computing is far slower than 32-bit computing. This is primarily because of ARM's RISC architecture which translates to smaller registers and limited resources. ARM was built with mobile computing in mind, focusing on low power consumption and increased efficiency, and with that goal in mind, fewer resources within a device return various benefits at the expense of performance and compatibility.