Here is a simple trick on how to disable the 30 fps cap limitation in the newest game Batman: Arkham Knight.
How to Disable 30 FPS Cap in Batman: Arkham Knight
Go to Batman: Arkham Knight folder and find there Config folder
e.g. C:\Program Files (x86)\Steam\steamapps\common\Batman Arkham Knight\BMGame\Config
Now open with notepad (or use any other text editor) an ini file: BmSystemSettings.ini
Press CTRL+F keys on your keyboard to open "Search", paste this MaxFPS=30.000000 and press "Find":
Now you should edit 30.000000 value to set desired fps.
For example you want 60 fps, then this string should looks like:
Save the file.
Enjoy your game.