The latest driver did that. I play Dying Light and the same thing happens. Rolled back to the Dying Light game ready driver and no more frame drops.

Go to geforce.com. Look for the Drivers tab, look for your GPU in the drop down tabs and download the one marked for Dying Light Game Ready Driver. Download it and install.

With Optimus, you're stuck with it, and no way to disable it in the laptop.

Which is why I got my Aorus X7 Pro, which ran off dedicated 970M SLI, and the onboard Intel GPU deactivated permanently. Optimus creates more problems than solution when you're treating your laptop as a purely gaming laptop connected to power plug all the time. Optimus only is useful when your gaming laptop is intended to double as a work laptop to extend battery life via switching to Intel GPU.

Extra benefit? Only non-Optimus laptops are expected to be able to take advantage of the upcoming mobile G-Sync feature, enabled once the drivers for mobile G-Sync is ready.

Maybe you can but having to do that or switching in and out of BIOS to do that, isnt what I call convenient. To each his own, I prefer no Optimus than having one at all. Optimus creates more problems for gaming on a gaming laptop than the sole convenience of prolonged battery life. For productivity laptops, you will need Optimus to enable you to work on your laptop longer.

Who are you reassuring, yourself or other people?

The thing is, if you're lugging around laptops with high end discrete graphics, you're not be using it other than playing games or doing graphics-intensive activities that REQUIRES plugging in your power plug. And yes, I do expect a gamer to 100% game on his GAMING grade laptop, because that's the reason they bought a GAMING grade laptop. I do. If I bought an expensive GAMING grade laptop and use that to do spreadsheets or web surfing, I'd consider that a gross misuse and money poorly spent, I could've gotten a cheaper, longer lasting Ultrabooks than a GAMING grade laptop.