Fix for the Windows Server lag issue

[demonstar55]

Reading the documentation on libuv for UV_RUN_NOWAIT, it says

"Poll for i/o once but don’t block if there are no pending callbacks. Returns zero if done (no active handles or requests left), or non-zero if more callbacks are expected (meaning you should run the event loop again sometime in the future)."

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