Mac mini slows down when there's new update

Hi! I just want to ask, is it normal for my Mac mini late 2012 to slow down and graphic glitches everytime when there's a new software update? When I update it to the latest macOS version, it runs fine but when it detected a new update, wallpaper turns black and everything slows down. Thank you!

Mac Mini late 2012 16gb ram 512gb SSD for OS 256gb SSD for backup MacOS 15.3.1

Author: @SuccessfulLove4593