@eddy_wm But you should bear in mind that need Thread.sleep only in one situation: if you want emulate blocking call or expensive computations

I am simulating some cryptographic block mining operations. Where you have to try something like this millions of times :

hash256 ( hash256 ( blockHeader + nonce++ ))

to find a certain hash under the difficulty target. Very common in crypto space with CPU mining algorithms.

You should use separate disaptcher for that (coroutines abstraction for a thread pool)