I start thinking this just a small glitch in video settings. When I choose to run game with nvidia card manually and show the nvidia gpu activity toolbar icon, I see that the game is running with my second gpu.
But it's very disappointing that game runs so slowly with mobile GPUs. On my i7 4700MQ, 8GB RAM, GT740M, I only could get 30 FPS when I run game in 720p and disable the most part of post processing effects.
You're right, I've noticed the same thing with my AMD Radeon 8800M. As has been mentioned above, game isn't optimized for mobile GPUs. I hope it will be fixed soon.
