Hello everyone, I also have these problems on both my Macs since Big Sur (big mistake to update as soon as it got released). A lot of graphical stuttering when changing desktops, opening apps, and minimizing windows. Slow startup and shutdown. Also, every time I manually clean-restart it, it says that the Mac restarted because of a problem. It is kinda unacceptable after many months of testing, to be honest. BTO iMac 27" 5K Retina 2017 Intel Core i7 4.2Ghz Quad-Core 32 GB 2400 MHz DDR4 Radeon Pro 580 8 GB 3,2 TB Fusion Drive MacBook Pro 15" Retina Mid 2015 Intel Core i7 2.5Ghz Quad-Core 16 GB 1800 MHz DDR3 AMD Radeon R9 M370X 2 GB 500 GB SSD Drive Hope Apple solves this ASAP. Regards,