Performance

zio has excellent performance, featuring a hand-optimized, low-level interpreter that achieves zero allocations for right-associated binds, and minimal allocations for left-associated binds.

The benchmarks project may be used to compare IO with other effect monads, including Future (which is not an effect monad but is included for reference), Monix Task, and Cats IO.

As of the time of this writing, IO is significantly faster than or at least comparable to all other purely functional solutions.