Fix memory usage (#751) #384

Job	Run time
linux-64-py3.10	5m 53s
prototype_mtc	44m 14s
prototype_psrc_in_development	17m 44s
develop-docbuild	3h 40m 34s
macOS	12m 31s
win-64	13m 52s
prototype_mtc	40m 36s
estimation_mode_test	22m 31s
prototype_arc	49m 1s
random_seed_generation_test	2m 22s
placeholder_psrc	49m 46s
prototype_marin	1m 34s
prototype_mtc_extended	3h 29m 35s
placeholder_sandag	1h 52m 51s
prototype_sandag_xborder	6m 17s
production_semcog	5m 25s
prototype_mwcog	1h 2m 49s
placeholder_multiple_zone	7m 55s
	14h 45m 30s

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