Oh. Well you said "in there too now" so I thought you were saying it was like xxhash in being insecure and fast. Even if that wasn't your intent, I wanted to make it clear to other people.

> Could you please expand upon what the main use cases are for non-cryptographic hashes?

Very fast hashes are good for hash maps, or even critical for them. That covers a huge amount of uses. And judging by the list on xxhash's website, a bunch of file transfer programs use it as well as bloom filter implementations, along with the databases that are probably using it for various maps.