I started a DFT code in Julia two years ago but didn&#x27;t get too far. I always felt that I have to think how to make the code fast in Julia (types&#x2F;vectorization), whereas I just <i>know</i> it will be fast in Fortran. So I always end up writing modern Fortran C-binded to Python. Was it just me not paying enough time to get used to Julia or was&#x2F;is it a real problem?