Only beginning with scenery design, I made some test. I made a 128 x 128 bmp for an approach light. On a lightpole I have a group of 5 lights. Now I can use 5 effects, for every light one effect. face should be 1,1,1 because it doesn't matter the effect follow my position. Or I can use the bitmap 5 times in one effect. In this case I set X Scale=5, 5 Y Scale=1, 1 ... Face=0, 0, 0 ... uv1=0.00, 0.00 uv2=5.00, 1.00 Every 2 m along the runway the the effects are. First with one row of the effect with 5 lights Second with 5 rows of the effect with 1 light inside. First results are, the FPS decrease down to 8 FPS with the 5 rows of 1 effect. With 1 row of the effect with 5 lights inside the FPS are 20 to 24. In my opinion it has no negative impact on FPS to change FACE from 1,1,1 to 0,0,0. It's better to repeat the bitmap 5 x in the effect than to use 5 effects for 5 lights. Some screenshots: The test row with 5 lights in one effect: At this moment 25 FPS!