Freezing with many instances

When you have many instances, some seemingly basic actions freeze the app or take forever (try with an empty file with ~160 instances, as it is in my case):

  1. Adding a new axis
  2. Selecting all instances if there’s a variable export and it is not the first instance

Version 3309

Can you send me one of the files?

Sure, but it’s even just an empty file with many instances. Try to copy-paste these 80 instances, and it takes forever (I stopped waiting after 2 minutes):

instances bug.glyphs (10.4 KB)

Or try adding a new axes with 160 instances here:
instances bug2.glyphs (15.1 KB)