[Enhancement]: DAV is slow

[MrGumpIT]

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What happened?

when I use the DAV connection everything is so slow, the UI lags a lot, I think you have to change approach, work on local files and when they change synchronize them

Version

2.1.0-rc.1

Platform

Android

Relevant log output

No response

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[CodeDoctorDE]

yeah it's not ideal. Feel free to improve it (it's inside file_system_dav.dart)