Currently, all item models are composed of several models representing each part, which are rendered individually, and then stacked on top of each other.

I am unsure of how much overhead is caused by this, and I don't really know how to measure it.

I need to look into a system of combining all meshes into one, to make rendering easier. I can then cache the meshes which are frequently used.

I'll close this issue for now. The current system works well with enchantment glints and z-flickering has been mostly solved.