Version:           1.13.0 (using 4.4.00 (KDE 4.4.0), Kubuntu packages)
Compiler:          cc
OS:                Linux (i686) release 2.6.31-20-generic

After upgrading to kmail 4.4.0, sending an e-mail takes nearly one minute after hitting the send button. The composer window stays on screen available for changes for a few seconds and my dual core runs at 70% on both cores. The processes hogging the cpu are nepomukqueryservice, nepomukstorage and virtuoso-t which suggests some weird interaction between kmail and nepomuk. I am available to give you any other information you might need to solve this issue.