10 ms·

You are correct. Everything that isn't a native for loop (forEach, map, reduce, etc) is slower than a native for loop. https://leanylabs.com/blog/js-forEach-ma

• dahart 4y ago
  Looks like it’s gotten better recently with ratios like 1.5x - 3x; it wasn’t that long ago that using the functional iterators was 10x slower than imperative loops. Still, I have a hard time choosing the functional iterators even the cases that are only 50% slower, and even though I prefer them for how clean and elegant it makes the code. Performance and energy use matters, especially in a physics engine. Defaulting to the slower style might not be visible initially, but is sapping cycles from every corner of the code.