I use Jitsi on OS X 10.9.5 with several accounts:
* AIM (inactive)
* Google Talk (inactive)
* 5 XMPP (one inactive)
I recently added a SIP one and an IRC accounts, and 9 chans with the
I then found my computer getting slow, and discovered Jitsi taking up
more than 100% of the CPU, sometimes peaking over 400.