GLTools is an application similar to ChainFire 3D which have many extra features than ChainFire 3D.Let's take a look at those features.
1. 16-bit rendering.
2. Lower rendering resolution.
3. Optimize Shaders.
4. Texture resizing.
5. FPS counter.
6. Fake GPU name.
CREDITS:- @n0n3m4 (app developer)
1. Download & Install the apk from the link mentioned.
2. Tick all the three options(at bottom of screen) and click Install.
3. Grant SU permissions.
4. Phone will reboot automatically(if it doesn't reboot manually).
5. After reboot open GLTools and choose the desired app from the app list.
6. Tick "Enable custom settings for this app" , "Force 16 bit rendering" , "Optimize GLSL shader" and "Use fake GPU info".
7. Click "Use a template" and select GPU of your choice.
8. Launch the app for which you changed the settings and feel the difference.