Start frame time at zero in `--lockstep` #450

Job	Run time
build-and-test (3.10, ubuntu-latest)	6m 25s
build-and-test (3.10, windows-latest)	4m 27s
build-and-test (3.10, macos-13)	3m 42s
build-and-test (3.10, macos-14)	3m 8s
build-and-test (3.11, ubuntu-latest)	6m 29s
build-and-test (3.11, windows-latest)	5m 51s
build-and-test (3.11, macos-13)	5m 10s
build-and-test (3.11, macos-14)	3m 23s
build-and-test (3.12, ubuntu-latest)	7m 11s
build-and-test (3.12, windows-latest)	4m 31s
build-and-test (3.12, macos-13)	6m 28s
build-and-test (3.12, macos-14)	2m 40s
build-and-test (3.13, ubuntu-latest)	6m 43s
build-and-test (3.13, windows-latest)	4m 11s
build-and-test (3.13, macos-13)	5m 10s
build-and-test (3.13, macos-14)	3m 46s
	1h 19m 15s

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