Check your processes, you might have the problem I had, where the blizzard voip program was bugging out with isboxer and causing it to use up all my processor power.
If that's the problem, you need to go into your blizzard classic folder, find the bliz voip.exe forget its name, and either delete it, or rename it, then relaunch your clients.
The issue you describe has been fixed in the live build of Inner Space for over 2 months now, so I suggest you update if you're still renaming or deleting files from your WoW folder to fix this.
Do not send me a PM if what you want to talk about isn't absolutely private.
Ask your questions on the forum where others can also benefit from the information.
Author of the almost unknown and heavily neglected blog: Multiboxology
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