Optimine

This mod along with Optifog are ancestors of OptiFine.

_303 updated version: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/1272900-1-5_01-optimine-unofficial

This mod improves FPS, especially for slower computers. Gains of 20FPS and more are common. Components:
 * FastRender: more efficient chunk queue processing.
 * UniText: a completely rewritten text renderer. It's faster and supports Unicode, although the Unicode font files are not included with this release.
 * Fewer glClears: erasing the entire screen is expensive. This mod avoids it when possible.
 * Better chunk drawing code: Removing a few useless transforms from the chunk rendering code lets all visible chunks be drawn in a straightforward manner.
 * Better Tesselation: Modified for speed. TNT explosions no longer cause clients to have horrible lag, and everything in general should feel faster.
 * Error handling: Don't go to a black screen when there's an OpenGL error. Print a decent error message to the command line instead.