Display Screen resolution and DPI changer, simple to use.
DPI Changer will help you to increase and decrease DPI of any android device. You can easily change the resolution of your device to fit content better on your device.

You just need to drag the slider to adjust DPI of your screen using the DPI Changer app, this will also work with volume buttons. This will help you to improve performance, boost and speed up games on your device by adjusting screen resolution.