Numpy was quite difficult to get working efficiently. J actually outperformed numpy pretty much any way I compiled it: https://github.com/vmchale/matrix-benchma

Numpy was quite difficult to get working efficiently. J actually outperformed numpy pretty much any way I compiled it: https://github.com/vmchale/matrix-benchmarks https://github.com/vmchale/matrix-benchmarks, even doing basic stuff like multiplying two matrices.