quote:
Remember the image is being drawn 500 times, if that makes any difference.
No If you use a higher texture resolution, then it will get slower (due to cache misses), but a 64² texture is virtually nothing for a 3D card. I would expect a larger performance drop when going from 32² to 2048², but not in his case. It will of course affect fillrate, but since his app is far from being fillrate limited, the problem is somewhere else.