IMO when anything is rewritten (usually in a modern language), it's faster than the original implementation. That's usually because you have much better hindsight since the entire implementation is finished before the rewrite is started.
I'm sure the more modern languages also help though, but I don't think that using a modern language is the major reason for the speedup.
I'm sure the more modern languages also help though, but I don't think that using a modern language is the major reason for the speedup.