Lags

Could anyone tell me how to improve the lag issue? When the button is pressed, the character immediately acts, but, its action happens a few seconds later (on the enemy/NPC). Also, the NPCs don't get activated until I re-enter the play area after leaving it first.
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Where are you from? Check the ping (Ctrl+R twice). Use VPN (Holland, Poland, etc.).
I am in New Zealand. I disabled the cross-platform play (or any co-op play), but the rubberbanding and lag remain. However, visually, it works flawlessly. :)