It mentions "lefthook" by name. I'm guessing that specific go-based hook manager doesn't do this parallelism. So it's saying "rust instead of go might give a sm

It mentions "lefthook" by name. I'm guessing that specific go-based hook manager doesn't do this parallelism. So it's saying "rust instead of go might give a small performance boost, but that's not where most of the performance boost comes from".