Absolute CPU time (filled symbols) on the left axis and multi-core efficiency (open symbols) on the right axis for MFP table calculation. The efficiency is calculated as η = t₁/ (nt_n), where t_n is the execution time on n CPUs. t₁ = 2t₂ is assumed since performing the calculation on only one core is too time consuming. The MFP table calculations were performed on an AMD Opteron 2.2 GHz system. The execution times are for a magnetic field B = 0.12B_crit and a temperature k_BT = 3 keV with a maximum error of 2/15. The CPU time scales with the table file size (see Sect. 2.4).