In the next few years, upcoming cosmological survey are going to produce a large amount of data. In order to extract as much information as possible, we need adequate software tools to analyze data. I translated my Python3 code, that I use to predict cosmological observable, in Julia. After a month of work, with no previous Julia exposure, I obtained a speed up of about 20. Now I am looking further to extend my Julia code and to apply extensively it in my research.