Request Description

Not sure if this fits since the main goal is rendering optimization, but out of all of the mods this seems the most fitting.

When taking screenshots, they are saved with an alpha channel, despite the fact that screenshots can never contain transparent pixels. We could make screenshots nontrivially smaller simply by using RGB instead of RGBA. (https://bugs.mojang.com/browse/MC-207091)

Debug graphics produced using F3+S would still use the alpha channel.

Not being considered. This kind of feature would best be kept to a different mod, perhaps one that improves upon the currently very basic screenshot functionality.