"""
regular "for"
loops are moderately faster than for each
loops in the minimal case.
Also, as with AS2 days, decrementing your way through a for
loop generally provides a very minor improvement.
But really, any slight difference here will be dwarfed by the requirements of what you actually do inside the loop. You can find operations that will work faster or slower in either case. The real answer is that neither kind of loop can be meaningfully said to be faster than the other - you must profile your code as it appears in your application.
"""