But how you explain that earlier versions worked well?
I have started using MP after 1.0, so I don't know if there was SQL used even on older versions?
You're right. There is more to it than that. If you want to work on it, you can try to find the SVN where it went bad. Then we can try to see what was changed and maybe have it fixed. I helped the devs this way recently with another problem.
recently I´ve experienced the problem of slow browsing mainly of Videos as shares view in MP 1.0.2. At last I could identify the problem: corrupt "folder.......db3" database file. All the time I thought that the video database was in use but not.... Deleting it solved my problem.