I going to guess that there is no material difference between A and B. No need to even consider C, unless you are already using a script for other reasons.
If you have a modern, reasonably fast Mac, then I doubt you could detect the difference.
However, if it is that important to you, then I'd suggest you run some timing tests, in a real-world environment. Each Mac is different, and it could make a difference on a highly loaded, slow Mac.
If you could be more specific about "firing off lots of stuff", then we could probably be more helpful.