Ic and makes sense. Need to take some time at some point and going to investigate it further - now i at least know where i gonne start. So far i just accepted it because well got enaugh projects to deal with already...
Thanks for the hint tho, if i should find the time to investigate that further this will definatly safe me some time on searching the cause-
What Steam does is to skip the compilation and download it from a cdn.
In your case something is not letting the driver cache the compilation.