Doofenshmirtz

When I play PZ I almost never "lag" in any sort of way. I played the tutorial incase anything was different than the older versions. It told me to eat a rat and I took it from the cabinet and then it started lagging. It only lagged when I was taking the item, but no longer than that. It is very annoying, since looting is one of the main features in this game. I played a run of apocalypse and it still did, I'm don't have any idea to why this happens and hope someone has a way to fix this.