There's tons of threads posted and lots of promising solutions. I have one that I've been testing for three days and have not had as much as lag spike when mousing over cogs. This works if you're willing to disable tooltips when you are anywhere a cog icon might show up.
You will need to create two macros, for "turn off tooltips" and "turn on tooltips".
Turn Off Tooltips
/script GameTooltip.Temphide = function() GameTooltip:Hide() end; GameTooltip:SetScript("OnShow", GameTooltip.Temphide);
Turn On Tooltips
/script GameTooltip:SetScript("OnShow", GameTooltip.Show);
This should get you through until the official fix comes down from Blizzard. Happy hunting!