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It depends. 16 People in itself probably wont lag it out so bad provided your using things like PaperMC and lagclear plugins.
However, all the servers are in europe so that may affect the performance that you feel
Lag clear plugins don't actually help much assuming you mean plugins like clearlagg
yeah that was probably a bad exaple
Although i think there are a few that optimise the server in general, unloading chunks and the such
(i think)
Clearlagg can unload unneccessary chunk, and even increase your server's TP , i tried
