About 1/3 of the time, when I start to rotate an assembly, there is a slight delay. Much less than a second. This is enough to make me "over shoot" the amount of rotation and lose my place in the assembly. After SW "wakes up" it will be very responsive. Is this typical? Dell 9150 2.8 GHz dual core 2 GB ram NVIDIA Quadro FX 1500 Logitech Cordless Mouse The assembly is about 10 meg with around 200 parts.