Question to experienced drag racers

Hello everyone. I need experience values from people who run drag racing every now and then. How much time difference on the 1/8 or 1/4 mile is created between a very good start and a start where you simply turn to the limiter and let the clutch jump? Or more precisely: How much worse are massively rotating wheels in a front-wheeler, if the response time to the signal is otherwise identical? How much meter difference does it make? There is currently a Discussion in a simulation forum about Live for Speed. And there above described method to start with full speed is pretty much the optimum, which seems very unrealistic to me. There it makes after 40m less than 0.1 seconds whether you start with feeling or without feeling. Thanks already for answers RIP