Hi, same here :-/ My MacBook Pro M1 with 32 gb ram takes hours to update XCode and Final Cut Pro....all the other apps on App Store also takes way longer to update than they do on my MacBook Pro 2015 Mid, Core i7. This is apparently an old issue, why isn't it fixed yet?
Most of the M1 CPU's have only 2 efficiency cores. Software updates, of most types, seem to be limited to ONLY efficiency cores.
Example: An incremental update of Microsoft apps Excel, PowerPoint & Word:
Yes, the processor types are different, but I don't think that is the problem. Using Activity Monitor to show the M1's CPU History shows the 2 poor efficiency cores are pegged at 100%, while the 8 high-performance cores are mostly idle.
I know of a couple of ways to changing a process from high-performance to an efficiency core. I do NOT know of a way to change a process from efficiency to high performance, as a user.
Given that the M2 processors ALL have at least 4 efficiency cores, I expect the problem is somewhat "fixed" on those machines but I have no personal experience with them.
It would be nice if the OS noticed the problem and allocated a high-performance core or two to address this issue (if the machine was a laptop, at least when the machine was plugged into power).