Fix memory usage #342

Job	Run time
linux-64-py3.10	9m 47s
estimation_mode_test	32m 50s
develop-docbuild	0s
macOS	14m 34s
prototype_mtc	58m 36s
win-64	13m 15s
prototype_mtc	1h 4m 52s
prototype_arc	1h 6m 37s
random_seed_generation_test	3m 25s
prototype_psrc_in_development	5m 3s
placeholder_psrc	44m 58s
prototype_marin	2m 21s
prototype_mtc_extended	3h 7m 1s
placeholder_sandag	2h 54m 37s
prototype_sandag_xborder	6m 24s
production_semcog	10m 11s
prototype_mwcog	1h 3m 13s
placeholder_multiple_zone	12m 5s
	12h 49m 49s

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