Benchmarks: Java vs C (Addendum)

Of course Assembler can be even faster than C. George Woltman's big number library (gwnum) - part of Prime95/mprime - for example, seems very fast, perhaps at least as fast again as GMP, particularly for extrabig numbers.
Gwnum also uses advanced FFT techniques, and because it is partly written in assembler, not surprisingly, it is not portable - only being available for the most common platform, x86.
It would be interesting to rewrite my WEP application using gwnum...
http://www.mersenne.org/freesoft.htm
http://en.wikipedia.org/wiki/Fft