[zbraniecki]

Hi, just for context - this was a comparison of `unicode-normalizer` crate to ICU4C.

Since then @hsivonen from Mozilla wrote a new normalizer that recently got merged into ICU4X - https://github.com/unicode-org/icu4x/tree/main/components/no...

I don't have perf numbers yet but I suspect it to be perf comparable to ICU4C at least.