Version: 1.12.1 (using 4.3.1 (KDE 4.3.1), ALT Linux i586) Compiler: gcc OS: Linux (i686) release 2.6.30-std-def-alt10 KMail works with IMAP very slow. I noticed that the message list is redrawn continuously during network operation. I suspect that the same thing happens when the splash screen is used too.
Yes, I can confirm this. KMail has gotten horribly slow going from KDE-3.5.10 to 4.x. I work on IMAP with many public folders, some of them with up to 45000 messages, and KMail is unusably slow when working on those folders. It takes several minutes just to display the contents of one such folder, and moving a few thousand e-mails to another folder (which whould be a server-side action) is undoable. Kmail consumes 100% CPU for several minutes, and then shows an error message complaining about server timeout. With KDE 3.5.10, it worked much faster. Currently using KDE 4.3.2 on kubuntu 9.10.
Thank you for taking the time to file a bug report. KMail2 was released in 2011, and the entire code base went through significant changes. We are currently in the process of porting to Qt5 and KF5. It is unlikely that these bugs are still valid in KMail2. We welcome you to try out KMail 2 with the KDE 4.14 release and give your feedback.