[noctune]

One reason why unordered map is slow is that it has to be a chained hash map due to the spec not allowing iterator invalidation when resizing.

[bertr4nd]

I believe unordered_map does invalidate integrators on resize, but does not invalidate references to keys/data, which means the data can’t be stored inline with the hash table structure.

[aidenn0]

that's certainly annoying...