There are too many texture reads in the fragment shader. This slows down the game.

[IntegratedQuantum]

Possible solutions:

• Separate shaders for textures with reflectivity/emission
• merge emission and reflectivity textures into a single texture to make everything with a single texture read.
• Conditionally read textures, only if needed

[IntegratedQuantum]

These performance problems are greatly amplified by anisotropic filtering. Disabling it seems to make things faster.