[Not using graphic card while rendering (or viewing).]

So I've problem about rendering than. It's done on slow intel GPU, not on NVIDIA one. And part moves really slow on UI.

[Not using graphic card while rendering (or viewing).]

I've a Lenovo notebook with intel hd3000 graphics and Nvidia gm940 external graphic card.

Also Win10 x64 installed.

While slicing a model and viewing as posprint, I realized that it lags so much.

Than I've looked up to the performance section of task manager and I saw that intel graphics is used %100 but Nvidia %0.

How can I determine the program to use real GPU?