switching cards problem

Hello. I have a laptop Dell Precision M4800.  I bought it with windows 10. After first windows update a problem with switching graphics appeared. I'm playing league of legends. There are 2 graphic cards  - AMD Firepro M5100  and  Intel HD graphics 4600.  Before the update laptop used the better one. The game ran smoothly but after that update laptop uses that worse card and my game is much slower and unplayable. I have that  AMD Catalyst control Center where I can switch the graphic cards. I select my game and set it at High performance (not power saving). But this doesn't change anything, my game is still  slow. Please help me solve this problem, if not I will dump this laptop. This is my first Dell laptop and I'm so disappointed.