This is a tough question jonimake. It is not easy to set up a test with thousands of real clients to measure the resources spike.
To give you an idea of how resource intensive it is, I’m currently running it on the very lowest Softlayer configuration ($28/month). The server currently occupies 45 MB of RAM, and the difference isn’t noticeable when 10 people connect. The CPU usage is very low as well.
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Maybe we should make an event, and have a bunch of people from the community log in at once and see where your set up starts having problems at. We could do similar tests when it is finished to make sure that the features dont lower the number or clients?