Unbelievable AI straight line speed

I have currently just finished the Saudi Arabian Grand Prix in MyTeam. I qualified in 8th place after a more or less lucky qualifying. But after the race I finished in 18th place. I can easily keep up with the AI during part of the track where the corners are pivotal. So sector 1 and partly 2. But when we hit the straights I loose around 6-8 tenth and the car behind me can just drive past as I wasn't there. 

After the first run of my qualifying I just checked my top speed compared to others and mine was on average 10 kph lower than everybody else. The AI top speed just stops any progress in the races. Please find some kind of fix to this problem.