How do I turn on "optimize for compute performance" for 970 GTX

my ETH hashrate has dropped considerably since the last 10+ hiveOS updates for my Nvidia GTX 970. Use to see as high as 17-20 MH mining ETH, now I only get 4.1 MH. tried drivers, over clocking, no substantial improvements. Any help is appreciated. I did see if I can change the “optimize for compute performace” in the Nvidia Control Panel, this will fix it. but have no Idea how to get to it in HiveOS.