Yep, all day all week now. It's literally been unusable on my 2018 MBP i9 since the 12.3 update. AppCode has no such issues, so I've been able to do MOST of what I need without launching Xcode, but anything on a XIB or storyboard is a lost cause now.
I've had to force close Xcode every time I dare to launch it this week.