Hi Phil,
I haven’t noticed an issue but there were big changes to certain things in 2.93
Python and the api changed, so some scripts and python related stuff will break or possibly run slow(?)
You will also get warnings if you try to open a 2.93 file in a lower version. (“Built with a newer Binary blah blah blah”)
Here’s a couple questions to help you dig into the issue
Is it the same scene in both versions (and are you running simplify on one and not the other)
Can you find what is slowing it down. (a specific mesh or prop or whatever)
If you hide it, does it speed up.
Maybe something is corrupted in that file, if you import everything to a fresh scene is the problem gone?
I have a suspicion that it’s probably a setting that was introduced and it “on by default” in the newer version, but that setting didn’t exist in the older version.
It’s not quite the same thing but when they moved the “show color groups” from the GE and Action editor into the user preferences I lost an hour or so trying to research where that setting went haha.
Hope you figure it out!