See screenshot. Reproducible: Always Steps to Reproduce: 1. Right-click on IMAP account. 2. In context menu, choose "Serverside Subscription..."
Created attachment 76575 [details] Screenshot
Confirmed. Will look at how to fix it.
Git commit e9ff6143dd662adfd718948cf932fcfd913be8ce by Montel Laurent. Committed on 20/01/2013 at 18:43. Pushed by mlaurent into branch 'KDE/4.10'. Fix Bug 313538 - KMail takes about 25 seconds to refresh background when you click on "Serverside Subscription..." in IMAP account. FIXED-IN: 4.10 M +20 -16 kmail/kmmainwidget.cpp M +2 -1 kmail/kmmainwidget.h http://commits.kde.org/kdepim/e9ff6143dd662adfd718948cf932fcfd913be8ce