[Help] My server lag with people install troll server crash into

My server use linux and run 0.3z R4



Have anti ddos but now someone join the server walking around make my server lag ( like bullet crasher before) but people near the place like Mall , Gym or somewhere got lag deply ... I try to teleport myself to LV but dont have lag just around the place LS or SF



I know someone have cleocheat destroy my server , i need you all help me for anti



I hope you all answer , thanks for reading my topic and sorry my bad english