Julia vs Matlab ArnoldJade 2019 Post-processing results from the open-source dispersal model Disp_GPU has traditionally been completed using MatLab. The development of a standard post-processing toolbox using free software is very appealing. Julia language, with good performance and similar syntax to MatLab, is a great candidate. This short presentation covers the trials and tribulations of re-coding a short script from MatLab into Julia. Using the example of a script that loops through millions of particles, and finding them in or out of a polygon, over 481 timesteps. What are the benefits? Can you gain insights from our experience?