I use Proton Drive on Android, installed from the play store. I have >250gb of data with, I think, 10s of thousands of documents. For a few months navigating the file structure was crazy slow, almost 30 seconds for each folder I entered.

I deleted the app and reinstalled and now it’s nearly instant for folders I use often.

If I dive deep into a folder tree that I haven’t used in months, with a lot of files, it takes ~2 seconds per folder.

It’s finally practical to make quick edits to docs using my phone!