WowAce

The precreation frames workaround to avoid a bug in blizzard secureheaders code that prevents to initialize frames in combat, causes too many indicator updates during the load layout process.

When the startingIndex attribute is changed to force the creation of frames for each header, blizzard secureheaders code will change the unit attribute of several frames, and GridFramePrototype:OnAttributeChanged(name, value) is called a lot of times.

Maybe this issue must be addressed, pending to check if this issue causes any performance problem in a big raid.