Light 4x4 RP

This resource pack is called Lightfor a reason — it features the lowest resolution possible per block, utilizing a tight 4x4 pixel grid. Granted, some visual compromises have to be made to achieve this level of minimalism. You can see how primitive the blocks become when looking at the ores, for example. Honestly, though, the overall scenery doesn't look bad at all. Additionally, certain textures, specifically the mobs, haven't been touched at all, maintaining some vanilla familiarity. Considering the massive FPS boost you get in exchange for a minor graphical downgrade, the trade-off is well worth it.

Credits: Mod MCPE