Reaktive sounds like a huge undertaking (re-impl rx from scratch). Did you do any performance comparisons with the "tried and tested" solutions like rxjava2?

Sure I did some benchmarks! https://github.com/badoo/Reaktive/tree/master/benchmarks/jmh They are a bit outdated, e.g. coroutines should do better nowadays. But RxJava shouldn't have changed much since then. The upcoming Reaktive v2 should also have better performance.

oh wow that's impressive! also I'm surprised at how bad Flow performed

Well, those benchmarks are two years old, Flow might perform even better now. But there are still some cases where it might be much slower.

That's what I was looking for, thanks! 🙂