There is a way around it ill tell you how i did it
Step 1 Go to f1 world
Step 2 Go to PLAY then accross to MULTIPLAYER GRAND PRIX then CREATE SESSION once you have done that choose NO OPEN then go to setting and LOBBY OPTIONS from there scroll down to where it says f1 world change to F123 CARS once that is done go to SIMULATION SETTINGS and at the very top Choose where is says equal perfomance OFF then go out and return to your coop game and the equal performace should fingers crossed be disabled..hope this helps worked for me!
best wishes
