I came across with this version of F1 06, the best one I was able to get. I know its an old version but its the last one while the new game comes out next year.
The problem comes at full races and some qualifying, it freezes a bit while all the cars are inside the track and lapping. Sometimes it improves, sometimes it doesnt, it depends on the number of cars racing . It's not on the entire lap, just on some sectors. The rest of the game works fine, no problem at time trials and loading.
I dont know if there is a method to fix it, maybe someone knows how.

Let me know.