Our paper from ICFP last year has extensive benchmarks against stock OCaml: https://arxiv.org/abs/2004.11663 https://arxiv.org/abs/2004.11663 In short there sh

Our paper from ICFP last year has extensive benchmarks against stock OCaml: https://arxiv.org/abs/2004.11663 https://arxiv.org/abs/2004.11663 In short there should be very little performance difference against stock. As KC has linked in a sibling comment there's a project going to explore using effects to write high performance IO libraries and that has some early benchmarks.