> I noticed that when used excessively, rb_hash_aref can become a
> bottleneck, even for a hash
> with symbol keys with just about 10 key/value pairs. So I looked into
> this a bit and found out
> that st_table is using Murmur Hash. We don't use Murmur3 [1] yet, do
> we? If not, how do you
> feel about upgrading?

https://github.com/rdp/google_hash might be interesting to you, but if
improvements can be made to core, even the better...