JS arrays are weird and (probably?) not memory-contiguous, but just for kicks, let's see what difference there is (if any) between performing the same action on 1,000,000 objects in an object-oriented style (with the method attached to the object) vs an ECS-style (with the behavior separated from the raw data)

Comparing performance of Set.has() vs Array.includes()

test performance of array sorting

Testing wether if a struct will be better suited for the job