I found the solution for the fps stucked at 50-60, all you have to do is:
Open RUN (windows key + R) -> type regedit -> HKEY_CURRENT_USER -> SOFTWARE -> BLIZZARD ENTERTAINMENT -> VIDEO -> Lockfb -> change the value to 0.
After i did this , my fps is now 80-100 on both graphics, integrated and dedicated.
You're welcome.