Replace many Pandas operations with NumPy #347

Job	Run time
Build with Python 3.9 on macos-latest	50s
Build with Python 3.10 on macos-latest	51s
Build with Python 3.11 on macos-latest	51s
Build with Python 3.12 on macos-latest	55s
Build with Python 3.13 on macos-latest	1m 7s
Build with Python 3.9 on ubuntu-latest	55s
Build with Python 3.10 on ubuntu-latest	51s
Build with Python 3.11 on ubuntu-latest	48s
Build with Python 3.12 on ubuntu-latest	1m 3s
Build with Python 3.13 on ubuntu-latest	1m 7s
Build with Python 3.9 on windows-latest	2m 42s
Build with Python 3.10 on windows-latest	2m 31s
Build with Python 3.11 on windows-latest	2m 13s
Build with Python 3.12 on windows-latest	2m 19s
Build with Python 3.13 on windows-latest	2m 32s
	21m 35s

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