I recall reading somewhere in early 2010 that WoW.exe was being changed for Cata to use all cores by default and no longer require setting CPU Affinity for more than 2 cores. Yet now that I'm 3-boxing again, it seems that I'm seeing usage on only 3 of my 4 cores. Also, my CPU Affinity settings are no longer in config.wtf.

Should I add settings for CPU Affinity back to my 3 copies of WoW?