perf: Improve nb cells #573

Job	Run time
pre-commit	13s
cppcheck	1m 25s
macos-mamba	16m 15s
linux-mpi-mamba	6m 51s
linux-mamba (gcc-10, gcc, gcc-10 g++-10, gcc-10, g++-10)	16m 53s
linux-mamba (gcc-11, gcc, gcc-11 g++-11, gcc-11, g++-11)	16m 37s
linux-mamba (gcc-12, gcc, gcc-12 g++-12, gcc-12, g++-12)	19m 42s
linux-mamba (clang-11, clang, clang-11, clang-11, clang++-11)	21m 37s
linux-mamba (clang-12, clang, clang-12, clang-12, clang++-12)	21m 59s
linux-mamba (clang-13, clang, clang-13, clang-13, clang++-13)	19m 56s
linux-mamba (clang-14, clang, clang-14, clang-14, clang++-14)	19m 54s
linux-mamba (clang-15, clang, clang-15, clang-15, clang++-15)	19m 11s
	3h 0m 33s

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