control panel has been replaced with the nvidia app, from driver 566.36 the app gets installed and is used as default, you can still get to the older control panel if you right click on desktop, with regard to the frame drops still happing even if you lock it, i would pay attention to the following GPU, PSU and Drives, be sure to update all drivers and make sure windows if fully updated, when you do play a game make sure the very least amount of background programs are running, as having too much stuff open in the background can hurt performance too. (NEVER use windows insider builds either, they are full of bugs, after all your the beta tester for windows if you do use it)