Comparison of several variance-reduction methods of TRIPOLI-4 for a benchmark configuration consisting of a transport cask for spent-fuel assemblies. The fiducial quantity to be assessed is the Equivalent Dose Rate (EDR) at 2 meters from the package, at mid-height. Top: radial and axial (zoom) cutoff of the benchmark model, with resin in yellow, steel shell in dark blue, and shock absorbers in pink. Center and bottom: analysis of the convergence patterns of neutron (resp. photon) EDR as a function of the simulation time (proportional to the number of replicas). The tested methods are exponential transform with INIPOND map (INIPOND+ET) or with IDT map (IDT+ET), AMS with IDT map (IDT+AMS), and weight windows with IDT map (IDT+WW). Figure adapted from reference [69]. (This figure is subject to copyright protection and is not covered by Creatice Commons License. SNA+MC, 2024).