1. My server was at 81 fps. now it has fallen to 22 fps. this is DDOS attack?
     
  2. try typing "targetfps 100" or a value you wish in your autoexec.cfg
     
  3. use one core(task manager -> details -> right click hurtworld -> set affinity -> cpu 0 for example)
    set high priority(task manager -> details -> right click hurtworld -> set priority -> realtime)
    and my add on autoexec

    targetfps 999
    loadbalancerframebudget 200
     
  4. CPU 100% 0 players online :c
     
  5. What are the perfomance of your server ?