MHL dock slow and better performance topic

Hi guys,
I'll explain in short my problem with my notes 4 ...
I bought the base samsung with hdmi (mhl) and when the integrated use on my samsung tv works perfectly but when I go to run games like Real Racing 3 or need for speed most wanted the game slows down heavily enough to make it unplayable!
The TV when I connect the terminal is self-imposed on 1920x1080x30.
Who among you can try and who knows give me some advice or answer?
I apologize for the English but I used the google translator! :)
Thanks to all