Got worse over time (Started sometime in iPadOS 17)
When I first got my iPad Pro M2, everything was smooth as hell, no lags whatsoever. Then I made the mistake of not turning off automatic updates, so it updated on its own at some point. After iPadOS 17, files app constantly lags now. Starting up the app was fast before, but now it needs to load for 7-15 seconds before you can do anything. Processing large files introduced lags now as well, even integrations like Google drive and the like is lag now. They massacred my boi.