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I tried it then ended up wrapping Vert.x with ZIO instead which is now open source. Is super-fast, lightweight and minimal.
In reality, your performance issues will not be http4s, but something else. That being said, there are improvements that http4s can and is making, and I'm quite excited about the future 1.0 release, which has some important and fundamental performance improvements already, like a a 125% performance improvement on the plaintext benchmark from https://github.com/http4s/http4s/pull/6091 - and finally, yes, akka-http does have very good performance, but you can also get good performance out of http4s.
Rho was abandoned for some time, but right now it is receiving updates and I believe we can expect the release pretty soon.
To add to this, there's also different levels of JVM tuning between akka-http and http4s: https://github.com/TechEmpower/FrameworkBenchmarks/issues/3442
whats problem with akka-http? it seems to be still maintained - https://github.com/akka/akka-http/releases