If you're still using CDs on a dead monster that is lag then pure and simple. The animation and CD usage is usually canceled completely if it tried triggering after the monster's death. Ametrine already answered your question then. This game is hardly slow to respond on a decent connection. The exception was in 2.0 when their netcode was very obviously bad enough for them to change how often the servers ping you. You seem really intent on bashing this game today, maintenance got you that bored?