Pixelthief, just to clarify what you mean by "having a line of code that dynamically names the loop". I have a custom movement engine that uses fastloops, obtained here. I am also using Fusion 2.5.
There is a line in my movement engine that says: 'start loop "X Move" Abs(X Offset(" Player ") ) times. Would that slow down fast loops / cancel optimization in Fusion 2.5 like you were saying? Because my app was running super slow on my Samsung S3 when i tested it today, and I am suspecting fast loops.