The controller function in unreal is separate to the physics engine. Raycasts and spawning do not need to wait for a new physics tick to do their thing. Interp

The controller function in unreal is separate to the physics engine. Raycasts and spawning do not need to wait for a new physics tick to do their thing. Interp and extrapolation do not delay your input. Interp fills in lag time with predicted movement for other player characters to hide 50ms+ of lag from the player. Your client side input still exists and is updated client side in realtime. It may get corrected by lag after the fact. Your input is not delayed to match their lag.