Since the most recent update this week (3.3.1 FB 4961)Lightroom CC is extremely slow and crashes frequently on both my 2018 iPad and my iPhone 6s. Both devices have latest IOS updates. This happens when changing profiles, editing tone curve, and just swiping through images. Everything is synced with the cloud. Anyone else having issues? Lightroom is currently unusable for me.
The problem seems to be resolved now. I had over 18,000 presets after importing them from Lightroom Classic to CC on my MacBook. I had a few VSCO packages and a couple others - had no idea there were that many individual preset files. I don't know if something went wrong in the import but I ended up with thousands of cryptically named presets that were pretty much useless without the original names. I didn't notice this until after the crashes started. Since the presets weren't doing me any good, I opted to delete the entire User preset group. This took a really long time and after it was done I uninstalled/reinstalled the Lightroom CC mobile app on my iPad and iPhone to get back to a fresh state. Since then I haven't seen a crash.