Interesting S-charger there. Can ya tell me about it?
Lag? Only yesteryear has it unless something is ill designed or mismatched.
Todays modern cars, well designed ones at least, have this issue preety much licked. I did here one guy complain about his ride, can't remember what it was off hand.
Effcient? I argue that. How much power is being robbed by the exhaust spinning the turbo? How much pressure from the exhaust does it take to overcome the intake tracks pressure in order to drive the turbo? How contaminated is the incoming charge due to the exhaust back pressure from turning the turbo strong enuff to provide the pressure?
