Unless you're experiencing noticeable speed issues, continue to not think about it (speed)

Don't guess; instead, Benchmark

I was guessing because I wasn't dwelling on speed :)

Unless I have to process lots of something with a big loop, I don't tend to think about speed unless it becomes an issue - my guess was about academic interest rather than practical concern.

Thanks for the benchmarking link - I have intended to try benchmarking something just so I know how to do it.