I bought a new $40 video card just for shaders lol.
With about 5000 bricks, none transparent, and 60 emitters, I get 40 FPS on Very high.
With 20000 bricks, 1000-2000 emitters, and 7500 transparent bricks, I'm forced to turn my shaders down to Minimum. At Low it is 17 FPS but at Minimum it is 80 FPS .
Shadows and emitters seriously affects the graphics card's performance, and transparent bricks also contribute.
But this is WAY better than when I had no video card at all.