www.gigstaggart.com/p253-shahbahrami.pdf Here's a paper on improving cache performance of JPEG2000 algorithms. A review of the JasPer list showed that they had also identified bad cache handling as a major slowdown. This paper claims a 3x speed up using the 5/3 lifting DWT and a 2x speedup using the 9/7, on top of already optimized code.