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...are equally bad if the tasks are ordered ascendingly according to the time they take. In any case, however, parLapply() and parLapplyLB() are even worse (because of the grouping effect highlighted above). If nothing is known about how long the tasks take (or if the tasks are in random order), clusterLapplyLB() and parLapplyLB2() provide quite good results, but still not a linear speedup. If the tasks are ordered descendingly in terms of the time they take, clusterLapplyLB() and parLapplyLB2() provide the best results because all workers start with the tasks that take longest and then, with increasi...