Have you actually profiled the Julia code you wrote and ensured that you have followed the performance tips in the manual? If you did it correctly all the time

Have you actually profiled the Julia code you wrote and ensured that you have followed the performance tips in the manual? If you did it correctly all the time should be spent in linear algebra operations, and so it shouldn't matter what language you implemented the code in since the performance is primarily determined by your underlying BLAS library.