Fix for the Windows Server lag issue

[peterigz]

I think you'd probably be ok to do that Huppy, just have to be careful to only merge in the relevant changes, not sure how much changed in net/main.cpp since your version.

We might just need to actually check the return value and run the event loop sooner.

I think letting LibUV handle the main loop simplifies things. Those sleeps are gone now but I didn't notice any difference in CPU usage either, it might even be slightly lower for us now.