We have the same problem since when have upgrade to AC16.
In AC15 we didn't experienced any problems but in AC16 the selection in the 3D windows very slow.
We tried many different settings in AC and in the Nvidia configuration menu.
Any idea's?
AC16-3270 NED FULL 64 + BIMX16
Windows 7 Professional 64
Intel Core i7 860 @ 2.80 Ghz,
10 GB Ram 1333Mhz (DDR3),
Nvidia Quadro FX 1800 768 MB