@Alex Cano your Q reminded me of this slide from a talk I saw last year at djangocon, which plots some empirical data on the case of gunicorn vs twisted requests processed/second on localhost... so a similar situation where requesting localhost/low latency can’t leverage async much at all so the difference is mostly from overhead this chart is from at 31:32. this whole talk goes pretty seriously into async and the whys and whens so the whole thing might be of interest to you if you haven’t seen it already