Mipmapping is a technique that can simultaneously:
Improve image quality.
Reduce memory bandwidth usage.
You can instruct the Mali GPU driver to generate mipmaps at runtime in OpenGL ES with a single line of code. Alternatively you can pre-generate the mipmaps with the Mali GPU Texture Compression Tool.
Mipmapping is an easy way to improve the performance of memory bandwidth limited applications.
Some applications have shown very large performance gains with mipmapping enabled.