It's called GLTools and it's from an XDA member called n0n3m4. What it basically do, is that it changes the overall graphics (and resolution) of any game and makes it playable even if your device has not enough performance to run it!
You can decompress/recompress the textures, optimize shaders, or enable MSAA or CSAA to improve graphics! It even comes with an FPS counter so you can check the smoothness on any app you want.
Does the app say that your phone isn't compatible? Fake the GPU info and fix the problem in a jiffy!
All you need to do is to download the app and install the plugins.
Make sure you make a backup before isntalling. Also ensure you have ticked the option to create the uninstall_gltools.zip file so you can easily revert and uninstall the plugins in recovery whenever it goes wrong.
Custom recovery & root is required.