Speed up Comparison #1498

Job	Run time
collect-experiments	5s
unittest	1m 14s
run-test (tests/ci/rand_soc.yaml)	32m 31s
run-test (tests/ci/randsoc_dumped.yaml)	37m 45s
run-test (tests/ci/vivado_bit_analysis.yaml)	15m 13s
run-test (tests/ci/vivado_bit_to_netlist.yaml)	12m 24s
run-test (tests/ci/vivado_conformal.yaml)	3m 52s
run-test (tests/ci/vivado_ooc.yaml)	18m 22s
run-test (tests/ci/vivado_phys_netlist.yaml)	15m 11s
run-test (tests/ci/vivado_phys_netlist_cmp.yaml)	20m 4s
run-test (tests/ci/vivado_phys_netlist_error_inject.yaml)	26m 11s
run-test (tests/ci/vivado_wafove.yaml)	19m 54s
run-test (tests/ci/vivado_yosys_impl.yaml)	13m 35s
	3h 36m 21s

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