Well, it’s turned my iPad mini 4 into a sloth unfortunately. Seems like more apps being unloaded than on 13, can take 10+ secs to fully switch back to something. I just think the OS memory footprint is larger.
turned on reduced motion and turned off background app refresh, didn’t help much.
Edit: I'll add that appears to be with certain apps more than others. Hopefully the new beta and app revisions will help.