WoW:CVar timingMethod

Blizzard says[1]:

There were some improvements made to better support Dual-Core CPUs.

This will require adding the following CVAR to the Config.wtf file located within the WTF folder inside the World of Warcraft install folder:

set timingMethod "1"

You can also type this command in-game, but will require a restart to save the changes:

/console timingmethod 1

If this does not help try setting the value to 0.