No I agree Malaysia AI is a bit slow.
Also the overall AI in Monaco is not slow but the AI always defends at Turn 12 which is pointless (nearly no chance to overtake). They lose a lot of time there and slow the cars behind down.
Yes I've noticed they defend there too at Monaco even with the default game files in place..silly indeed as you can get right around them on the outside when they defend the inside. I think that would boil down to a racing line coordinates issue.
Thanks for the feedback about Malaysia, I'll get working on that and Bahrain tonight