Step 1: Okey first get up task manager windows - hold ctrl, alt, delete. Step 2: Now go ingame and bring up task manager again, you should see under applications theres 'flyff' Now right click it and 'Go to process'
Step3: This brings you to processes and should have MyNewNeuz highlighted there, right click 'mynewneuz' than 'set priority' and click 'high'
Than it says using this may cause unstablty, meaning it will slow other stuff on computer while flyff is on. Press ok and enjoy no more lag well on your part.. server lag will still effect you