Also compare with qdrant's Rust implementation; they tout their performance. https://github.com/qdrant/qdrant/tree/master/lib/segment/src...

From a quick survey of the implementation probably not very well since, for example, it is using dynamic dispatching for all distance calculations and there are a lot of allocations in the hot-path.

Maybe it would be better to post this repository as a reference / teaching implementation of HNSW.