I just re-ran the benchmarks and I was mis-remembering those statistics quite a bit. It looks like C# takes 124.5 nanoseconds on average for a hash set lookup.

I just re-ran the benchmarks and I was mis-remembering those statistics quite a bit. It looks like C# takes 124.5 nanoseconds on average for a hash set lookup. This was benchmarked using BenchmarkDotNet :)