Quakelive uses Intel HD 4600 instead of GT 750M ? And even with GT 750M only 125 fps?

Hi, I have a really weird problem:

The first thing I did when I got my Dell XPS 15 9530 (Intel i7-4702HQ 2.2-3.2Ghz, 16GB RAM, GT 750M) was running Quakelive. I easily got 250fps. Well after some app installing, connecting external display etc, I wanted to start it again and had a lot of troubles:

Quakelive on external display via HDMI will not run with GPU although I set it so in the nvidia settings. Only when changing "Always use NVIDIA GPU" it will run with the GPU. How ever, even then I will not get 250fps (only 125fps). I tried to run the game again on my laptops screen... only 125fps. 2 hours ago I easily had constant 250fps. Whats going on ?

Any ideas? I believe NVIDIA Optimus technology is bugging around.

@edit: Basically the game runs fine in window mode with 250 fps but as soon as I go into fullscreen it starts lagging. Window & Fullscreen mode are set to the same resolution.

 

Nvidia control pannel and go to force it to use the dgpu

 

I did that. And according to the ingame command "R_lastvalidrender" I am using the dgpu. Also the nvidia icon says that the game runs with the dgpu.

In window mode I get 250 fps. When I go back to fullscreen it needs to "load the game again" (kinda like vid_restart) which I never had before when switching between window/fullscreen.

In fullscreen mode I don't even get constant 125fps.

Fullscreen & window mode have the same resolution.

Running QL in Windows 7 compatibility mode seemed to help a little.. I am now at ~150fps - 200 fps (fullscreen).. but window mode still has constant and smooth 250fps.

 

Why does it matter, you are getting over 150fps? thats faster than your screen refresh rate anyway.

 

Because it will still result in a smoother gameplay will less tearing. Besides higher fps gives u a little advantage due to the game engine.