Hi there, after a while of racing on brianza with the BT20, i have a look on the Framedropping at this Track. The first point is the backyard behind the Pitlane, when you drive with 19 AI-Drivers the frames drop down to 12-20 Frames in the Backyard. After the first lap, when you pass the pitlane again you have the same Problem in this area... ! Could it be that ISI forgot to clip the cars behind the Pitlane out? I mean they are not on the Track...not insight...but they still reduce the FPS dramaticly.
Does the same thing happen without any other cars? Sounds similar to an issue I'm currently having. Posted about it here - http://isiforums.net/f/showthread.php/6315-FPS-Sudden-Drop Oh, and what a surprise. Having checked your profile, your pc appears to be a very capable machine. So, probably isn't that then.
The old Sound Frames The problem still exists when get in to you practice session....in the first laps when the other cars stay's in the carpark, the frames dropping dramaticly at the pitlane in each lap...when they are on the track then will only lost 2-5 Frames at this or each other point of the track... it is only at the first 5 minutes on the session... so i came to the decission it must be a clipping error that easy makes...the cars are not on the track on not to see but it costs many of the power or frames to calculate them...so i ask my self why?