Increase your "world detail" graphics setting. Pit crews only appear when this is set to it's highest setting I think.
world detail pulls a lot of fps on maximum, mainly because secondary trackside objects are demanding. There should be massive optimizations to things like these with 1.1 AC. to help you squeeze a few more fps out of your systemOhh, yes... I run AC in low... almost all settings, but well... even enjoy the sim a lot
Thanks for the reply!