Dumb question, but alpha adjustments on an object would be more or less costly then either a. and animation (SM2), or a sclae(iTween)?
maybe i am wrong but i think will be the same…
the cost is when you render the object not when you change the value.
but you can use the profiler to check it… both are easy to implement for a quick test with the profiler.
look the the draw calls.