Version:           4.4.2 (using KDE 4.4.2) 
OS:                Linux

If you have a lot of IMAP folders, the IMAP routine can take a long time to scan all of them.   It would be useful if under the "Properties" dialog box for each folder, there were an option that permits you to indicate you would like that folder NOT to be checked for email.  So for example, a folder where I store old, read but still important emails, that doesn't itself need to be checked, can be omitted from the IMAP scan.  Ideally, if you select that folder and press F5 you could over ride the "omit" function.

This option would give users a way to make IMAP a lot faster.

Reproducible: Didn't try