This is what I meant. I suspect the 0.01 probably encapsulates ALL these little sub-optimisations I decide on in a code base, rather than just this one variable swap. CPUs are a lot faster than most people realise. It's usually other things that slow down a program, not whether the programmer uses array.forEach or a basic for loop.
Disclaimer: I do tend to use for loops a lot since they can be quite readable.
