Rovo,
It sounds like you are importing your library again from scratch. Why not transfer your existing MC21 library to MC22 instead? In MC21 do File > Library > Backup Library . Then, in MC22 do File > Library > Restore Library. Use the file you made in MC21 in the previous step. This should transfer all settings, all library members, all analyzed audio parameters... everything. So there shouldn't be any unnecessary background processing going on.
Brian.