Sorry, but t/c does slow you down and I have timeslips to prove it. Your car is going to want to spin the wheels when it takes off at decent rpm, whats better, let them spin a bit, or retard timing and appply brakes while gas is floored (like t/c does). It is proven our cars launch alot faster and get better 60' times with t/c disabled. Also with t/c on you still have abs, which you can't thresh hold brake with slowing you down, and your powering out of a turn and your wheels start to slip. t/c once again pulls timing and brakes to stop spinning, which is bad and slows you down. I have timeslips and laptimes to prove all of this, as do many other people.