Most of the volano testsuite is based on messaging server tests (for their chat server software). Those are keeping live connections all the time so they have to run many threads at once. It doesn’t scale very well because of that.
Servoy uses a short connection protocol that only builds up a new connection when needed, that may be a bit slower (we are talking about miliseconds here) but it scales much better.
Servoy does have a live connection by default (the so-called 2way socket factory), like volano because when clients are behind firewalls or nat routers they can’t talk back to the server without it. For better scaling you should disable 2 way socket factory if your clients are on the same network.
We don’t do this by default because we want to support as much as possible different configurations after a default installation.