TBH, i was jsut wondering this. I blasted round the 'ring in my Lupo in around 8 minutes or so (literally, turn in accelerate, laugh at the endless amount of grip).
I tried doing the Mercedes 'ring challenge before (in the Gullwing) and it was a lot more realistic (sliding, braking) and my time was also around 8 minutes.
Saying that, I've not noticed the physics option in the menu either like on Prologue.
But it was fine yesterday and earlier today. It's getting longer each time i turn the game on
If that is the issue, its embarrassing, how much worse is it going to get