You still have to use caution when introducing blocking code, rather than suspendable code, into coroutines

I was at a Vert.x talk the other day where the guys mentioned they are going to be adding Kotlin Coroutine wrappers quite soon

In a similar vein to their Rx wrappers presumably

https://www.techempower.com/benchmarks/#section=data-r8&hw=i7&test=plaintext This is plain Vert.x (in 2013) handling ~650k requests in a second - I wouldn’t expect a huge dent in that number by then offloading to a coroutine context - but you could probably get a hold of the benchmark code to try it out