Describe performance improvements. #35

Job	Run time
build_wheel_and_sdist	14s
run_speed_tests (3.9, ubuntu-24.04)	20s
run_speed_tests (3.13, ubuntu-24.04)	16s
run_speed_tests (3.9, windows-latest)	29s
run_speed_tests (3.13, windows-latest)	36s
	1m 55s

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