Impact of grid resolution on code execution time and luminosity balance. Top panel: Relation between the code execution time and the number of grid points per logarithmic decade in particle energy for three scenarios of fast cooling electrons described in the text (see Sect. 3.1). Colored triangles indicate three choices for the number of grid points per decade that are used for the results shown in Fig. 2. Bottom panel: Ratio of bolometric photon luminosity to electron injection luminosity versus the number of grid points per logarithmic decade. A ratio of one indicates the expected energy balance between electrons and photons.