Refactor for performance #943

Job	Run time
test-linux (3.9)	3m 58s
test-linux (3.9, uncertainties==3.1.6)	4m 13s
test-linux (3.9, uncertainties>=3.1.6,<4.0.0)	4m 36s
test-linux (3.9, numpy>=1.21,<2.0.0)	3m 54s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	4m 58s
test-linux (3.9, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	4m 0s
test-linux (3.10)	3m 47s
test-linux (3.10, uncertainties==3.1.6)	4m 33s
test-linux (3.10, uncertainties>=3.1.6,<4.0.0)	6m 43s
test-linux (3.10, numpy>=1.21,<2.0.0)	6m 6s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	5m 4s
test-linux (3.10, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	4m 39s
test-linux (3.11)	4m 16s
test-linux (3.11, uncertainties==3.1.6)	5m 58s
test-linux (3.11, uncertainties>=3.1.6,<4.0.0)	5m 14s
test-linux (3.11, numpy>=1.21,<2.0.0)	4m 52s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties==3.1.6)	4m 49s
test-linux (3.11, numpy>=1.21,<2.0.0, uncertainties>=3.1.6,<4.0.0)	7m 35s
test-linux (3.9, numpy, matplotlib==2.2.5)	5m 13s
test-linux (3.9, numpy, uncertainties, sparse xarray netCDF4 dask[complete]==2023.4.0 graphviz ba...	5m 58s
test-macos (3.9)	4m 45s
test-macos (3.9, numpy>=1.21,<2.0.0)	5m 7s
test-macos (3.10)	4m 52s
test-macos (3.10, numpy>=1.21,<2.0.0)	5m 43s
test-macos (3.11)	5m 39s
test-macos (3.11, numpy>=1.21,<2.0.0)	6m 25s
test-windows (3.9, numpy>=1.21,<2.0.0)	1m 11s
test-windows (3.10, numpy>=1.21,<2.0.0)	58s
test-windows (3.11, numpy>=1.21,<2.0.0)	1m 19s
	2h 16m 25s

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