Though I'm sure most everyone here is as always ahead of the lil Dwarf I'm posting this for the 2 people who may not know.
If you've been experiencing a lot of lag etc. since 4.2 the culprit is Recount. It's out of date and not currently upgradeable. Disable or Uninstall it and all is perfect.
I've read of a couple other potential hassle add-ons but all of mine were upgraded and all is good.
You're Welcome-I accept Paypal.
This fixed recount or me:
Download the newest rev of recount, and edit line 977 of Tracker.lua to:
function Recount:CombatLogEvent(_,timestamp, eventtype, hideCaster, srcGUID, srcName, srcFlags, srcFlags2, dstGUID, dstName, dstFlags, dstFlags2, ...)
And as always my work here is done. I may not know how to fix it but somebody with an inquisitive mind will and make all the problems go away 
Agio said:
And as always my work here is done. I may not know how to fix it but somebody with an inquisitive mind will and make all the problems go away
I do what I can ^_^