Hello, so this issue happened to me this yesterday/this morning My server started to lag out and i couln't type any command in. I thought it was normal so i restarted my server and it happened again. So i give another tried and restart server again and check the console. One user caught my eyes because whenever he joined the server it started to lag out after he joined. So i check players folder and it turn out that he is a new registered user that just joined today. I went to check his IP and look it up at iphub.info because of my ciriousity. It turn out that his IP was classified as Bad IP/Proxy. I thought nothing of it and just simply banned that IP. Few minute after that a new user under a new IP joined and my server lag out again. So i went back on the site and search up his IP again and it turn out to be the same thing "Bad IP/Proxy". Is there anyway i can solve this issue because i'm getting irritated and annoyed.
I am not sure if this works, but you could try to use a proxy blocker like https://github.com/artulloss/VPNBlocker/ or https://github.com/Muqsit/ProxyBlocker (update needed). Both of them use https://iphub.info/.