Citra Shader ((new)) -

: Developers frequently release "Progress Reports" detailing improvements to the renderer and shader pipeline. For instance, the Citra Hardware Renderer update on Reddit highlighted major speed gains through improved shader handling.

Beyond standard rendering, Citra supports post-processing shaders that enhance the visual quality beyond the original hardware's capabilities: citra shader

: This API typically offers faster shader compilation and better overall performance than OpenGL. Linear Filtering citra shader

This is a custom combo often found in community shader packs. citra shader

For the purists. These add subtle lines that mimic the physical display of the 3DS.