In addition to the ERB generation and removing all the tracepoints mentioned in the sister comment, there is also a change in the hash function used for Hashmap

In addition to the ERB generation and removing all the tracepoints mentioned in the sister comment, there is also a change in the hash function used for Hashmaps. The new one needs roughly half the hashing iterations so it should slightly speed up any application that uses hashtables. (aka pretty much every ruby app)