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XXHash has made pretty decent inroads and is integrated into many products already, we use it for Geohashing at scale on Spark and can't fault it!

meow is certainly not solid. it's brand new and still being discussed.

regarding the "extremely fast" claim: it's only fast for large blocks, not for normal strings. it's the perfect hash for a file or block digest, certainly not for a hash table.

According to the developer the upcoming release will be faster even for small blocks

https://twitter.com/cmuratori/status/1060718409296437249

tip: Whenever someone is claiming "extremely fast", like xxhash or meow look at independent benchmarks. Nobody beats the simplest multiplicative hashes, esp. such big ones.

Meow requires several instructions that make it difficult to use in practice for a while.