Fast Bamboo
This mod fixes an oversight in the original BambooBlock class from Minecraft developers. It makes a minimal change by overriding a method that gets called during graphics rendering.
In the standard version of the game, this method always returns a value of 1F, but because Mojang didn't properly override it, complex computational logic is executed for every bamboo block in the chunk. Fast Bamboo fixes this issue by making the method immediately return 1F instead of performing unnecessary calculations for each individual block.
As a result, the time required to render bamboo in the game is significantly reduced. Although the solution isn't perfect, it provides noticeable performance improvement compared to the vanilla version of Minecraft.
Performance

The mod is open source and distributed under a permissive license, allowing it to be freely included in any modifications and packs without the need for special permission.