Quote Originally Posted by 'magwo',index.php?page=Thread&postID=167797#post16 7797
You can try using Nvidia Perfhud:
http://developer.nvidia.com/object/nvperfhud_home.html


It might take some tinkering to make it work.. but it's a great tool for discovering where your bottlenecks lie. In particular, you can study the distribution of time spent in Driver/GPU in relation to total frame time.
This may be the moneyshot.