Which UI mod for Multibox?

[Daeri]

The issue you describe often lies in addons which make intensive use of the communication channel. You might want to check if it's the case for you with this addon : spamfu

Also, altoholic is a very nice tool but I unfortunately find it a bit too much cpu intensive for my computer, even when running on a single account (it keep scanning everything all the time) so you can imagine how worse it can get when I start running several accounts at once. Not to mention that syncing between accounts must be done manually and can take a while and I would always forget to do that step before logging out :P