Optimization of CalculateZeta functions #371

Job	Run time
build (ubuntu-latest, 3.7, gcc, g++)	21m 29s
build (ubuntu-latest, 3.8, gcc, g++)	21m 10s
build (ubuntu-latest, 3.9, gcc, g++)	20m 7s
build (ubuntu-latest, 3.10, gcc, g++)	20m 3s
build (ubuntu-latest, pypy-3.9, gcc, g++)	1h 10m 57s
build (macos-latest, 3.9, cc, c++)	24m 41s
build (ubuntu-latest, 3.8, clang, clang++)	23m 25s
build (ubuntu-latest, 3.9, gcc-11, g++-11)	19m 52s
build (windows-latest, 3.9, gcc, g++)	21m 9s
	4h 2m 53s

Provide feedback