Overall graphics quality.

Cap the frames per second.

Run the client in fullscreen.

Render resolution.

Sync frames to your monitor.

Smooth jagged edges.

Glow around bright surfaces.

Grass and foliage density.

How far the landscape renders.

Apparent size of the sun.

Allow scenes to control lighting.

Resolution of cast shadows.

How far shadows are drawn.

Batch draw calls on the GPU.