This is not the place for such messages. forum.kde.org have a Discussions & Opinions section. Take your concerns there and maybe someone will answer you.
You said you were experiencing heavy activity that slowed everything and I pointed to Strigi as a likely candidate. At no point did I suggest that it was making your kmail unusable. This appears to be some problem with your setup and this is not the place to get help with the problem. There are mailing lists and forums for that. My reply was an attempt to help, despite the fact that this is an inappropriate place for the discussion.
Let me mention that the problems I cite which make Kmail unusable were encountered on fresh installs of Slackware 13.1 and 13.37 on freshly formatted partitions. All software was installed. If the major program Kmail is unusable under such circumstances I suggest that advice to do something with MySQL is misplaced. Slackware and KDE4 are not new products. They are supposed to work out of the box. They should not be dependent on user action with respect to the toally unrelated program MySQL.
If there is another place I can reach the KDE developers please give me a pointer.
John Culleton (Slackware user since the days of a tray full of floppies).