Version: 4.1.0 (using 4.1.00 (KDE 4.1.0), Kubuntu packages) Compiler: gcc OS: Linux (i686) release 2.6.24-19-rt If using a remote calendar the file is retrieved from the server. When looking at the month view and then switch to next month it takes more than 5 seconds until the next month is shown.
While you're waiting for the month to switch can you see if korganizer is using 100% of CPU? If it is, this is a dup.
Monthview performance issues were fixed in >=KDE-4.1.4, closing.