Can UE4 simulate large code and physics properly if it lags?

Thirsty are we? Yous are just hungry for knowledge. How about this - if you want to help me create AI and change the world and stop people from dying and get us some fun *quicker, then you can know lots of stuff. If not help me, then, why need to know right? It’d be like you just sit there knowing deep knowledge - and that does nothing.