The graphs are updated now. I also resolved an MSVC issue due to a missing include <limits>. I've reuploaded algorithm_sorting.zip to the Boost Vault. A friend of mine ran tune.pl with MSVC and found these results: integer_sort is 30% faster than std::sort string_sort is 88% faster than std::sort float_sort is 460% faster than std::sort He also found that the ideal MAX_SPLITS on Windows is larger. On his system 12 was ideal, but 16 was close. On some Windows systems MAX_SPLITS 16 will probably be ideal, due to whatever 16-bit optimizations are in the OS. The value of MAX_SPLITS is important to the performance of this algorithm; the other values aren't as critical, and can usually be left alone. On OSX/Darwin I get roughly a 2X speedup across all three algorithms. Questions: 1) Is it a good idea to automatically detect the OS, and for windows set MAX_SPLITS to 16, and for all other OSes set it to 10? Or should I just leave it always 10 and let the user modify it if they are performance-conscious, using either the tune.pl script or manually? 2) Does anyone have any issues with this library? Besides comments on MAX_SPLITS, I think this is done. Steve