The framework looks very interesting! thank you @sfuerst
indeed I think that the memory usage is the crux of the problem when running multiple simulations at once (for very memory-intensive models). From what I understand though, if you compare independent runs in parallel vs. one run in parallel, it seems reasonable to say that running simulations independently should be actually faster not slower (if you can utilize all cores in both situations), simply because there is no between-cores communication overhead.