TidBITS:

Persistent rumors suggest that Apple will switch from the Intel x86 processors in current Macs to ARM processors like Apple’s A series of chips that power iOS devices. Apple has said nothing about such a transition, but that’s par for the course for Apple.

Apple has successfully switched the Mac’s processor twice before. In 1994, Apple moved from the Mac’s original Motorola 68000 processors to IBM PowerPC processors. And in 2006, the company ditched the PowerPC in favor of Intel x86 processors. Both transitions were fairly smooth due to years of testing—Apple maintained a version of Mac OS X running on Intel chips years before the first Intel Macs shipped. Apple almost certainly has a version of macOS running on ARM right now, in some secret lab.

I don’t have any inside information on whether Apple is working on ARM-based Macs. But let’s look at the pros and cons of switching from Intel to ARM.

Given where Apple is at and where it seems to want to be, there’s no case needed to be made from the company’s point of view. All that’s left is implementation. And Apple is not “working on” ARM-based Macs. That part is done. They have them. They work. And they are fast.