Better Leaves adds additional layers to leaf blocks, making them appear more bushy, dense and natural.

A banner showing a leaf block with the text 'Better Leaves Performance Update'

Version 9.0 is focused on performance, with textures being automatically created for every leaf. Unlike 8.1, this is not dynamic, so you have to follow a few simple steps to compile custom versions for use with texturepacks. I have already done so for Minecraft's Programmer Art textures.