Okay, CPU usage testing is now complete!
I ran the Winter bite server on my VPS, with 10 players, who were all walking around.
Here's the playerlist:

And this is what my desktop looked like during the test:

As for the CPU usage, the
average was 15%, with small spikes every 6-8 seconds of 19%.
So...
HanmerHost can hold twice as many Winter Bite players as I originally expected: 18-20!My previous expectation of 10 players was an inaccurate extrapolation.
Plus, I'm probably getting
new, dedicated hardware soon!