(mostly) Finished a major performance win. I figured out a way to use the vertex shader instead of the geometry shader for everything. The geometry shader is notoriously slow (5-10x) compared to everything else, so by not using, my idle performance has went up several times due to no longer having to slowly process so many triangles. I still have some room for improvement (iron golems are black and some weird new backface visual bugs, nothing severe though) but this is much better than before!