Doesn’t matter. You can run servers on ancient computers. Wingy uses (used?) a 2006 Mac and performance in the server is fine.
Processing power - The app only uses one thread, and with a lot of servers takes ~25% of the CPU running that thread. If you have 4+ cores you shouldn’t notice it.
Memory - I’m guessing you mean disk space, worlds can get really big, but it takes a LOT of playing for that to happen.
RAM - Not really. The app is fairly lightweight.
Since the app only uses one thread, probably not.
Ditto. The app pauses servers that aren’t in use, so they shouldn’t affect much.