Runtimes for various settings of the sparse source solver of SLITRONOMY. Top left: propagation of the noise to transformed starlet space, for different source to image resolution r_pix. Top centre: computation of the lensing operator F for different r_pix. Top right: computation of F for total number of data pixels. Bottom left: optimisation of the source light s for different choices of the minimum allowed total number of source pixels. Bottom centre: optimisation of s for different r_pix and number of source starlet scales J_s. Bottom right: optimisation of s for varying total number of data pixels. We refer to the text for more details (https://github.com/aymgal/SLITronomy-papers/blob/master/paper_I/benchmarks.ipynb.)