ok, i'll organise that.
re Library rebuild. the system crashes before completion.

Hi,
650k is big library Can you please Compress library (ZIP/RAR/7z should be <150MB), open support ticket and supply us DL link for library for us to analyze. Rebuild Library depends on PC speed it can take few hours.

Also it is possible that now playing is overcrowded (even MM5 handle that faster than MM4) that slows MM.

I would like to get to bottom of it.

650k when the library is fully loaded

1) This is a slow process as each file needs to be read and compared with database values
3&4) How many files in view?

I am experiencing frequent crashes & extremely slow performance. Debug error reports have been submitted on each occasion
eg
1. Files to edit - db/tag mismatches - Very slow (2 sec per album)
2. Manage database - rebuild - never completes (debug reports sent)
3. Sorting on columns - very slow also no status indicator to show that sorting has started/in progress/finished.
4. loading library - Reading Files - Very slow 5 - 20 minutes