Fusion is anything but light, and still not optimized for M1 (still a Rosetta app). Even on a beefy Workstation, it’s no fun. Logic is better but not exactly light if you have multiple track, AU plug-in…

So that’s not surprising - heck, with 16gb or ram it’s not a walk in the park. I’ve discussed with owner a Mac studio, and they were not happy for Fusion either, that’s with 64gb of ram so…