MustangManiacI have never seen it "realistically" demonstrated that it is faster to drift around a corner. You drift due to a lack of grip, a lack of grip equals loss of forward momentum, a loss of forward momentum means you are slowing down.
I agree with MustangManiac.. There is no way that drifting is the fastest method of driving a high powered, open wheel, wings & slicks, race car around a circuit.
Drifting is about big angles, tyre smoke, style(!?) along with a high average speed - a slight, four wheel slide when on the limit is not called a drift... Its called 'low downforce'!