The lookup performance gain is largely due to the CHAMP implementation using the default Java equality semantics, while Clojure's maps use Clojure's more expens

The lookup performance gain is largely due to the CHAMP implementation using the default Java equality semantics, while Clojure's maps use Clojure's more expensive equality semantics. See https://github.com/lacuna/bifurcan/blob/master/doc/benchmarks.md#maps https://github.com/lacuna/bifurcan/blob/master/doc/benchmark... for a more in depth illustration of this. However, it is still a meaningful incremental improvement over Clojure's implementation for iteration and equality checks, among others.