So I start getting these weird lag in the middle of act 1 and much more serious in act 2. The game starts getting a lot delay on the action, like A LOT.
Click a character to start a conversation require like 3-4 seconds of reaction time and also when characters are moving around, sometimes I will see them teleporting everywhere just like in a high ping multiplayer game.
Also when in combat, some of the ability simply didn't do any damage to the enemy due(maybe) to the weird delay as well. Not 100% sure it is the reason but this only happens after I am having some serious delay in the game.