Improve `partition_load_balance` #95

Job	Run time
CMake Matrix Test. (Linux Min GCC, ubuntu-20.04, gcc-9, g++-9, 3.7, 3.19.x, ON, OFF, static)	12m 26s
CMake Matrix Test. (Linux Min GCC, ubuntu-20.04, gcc-9, g++-9, 3.7, 3.19.x, ON, OFF, shared)	12m 29s
CMake Matrix Test. (Linux Min Clang, ubuntu-20.04, clang-9, clang++-9, 3.7, 3.19.x, ON, OFF, static)	12m 25s
CMake Matrix Test. (Linux Min Clang, ubuntu-20.04, clang-9, clang++-9, 3.7, 3.19.x, ON, OFF, shared)	12m 2s
CMake Matrix Test. (MacOS Min, macos-11, clang, clang++, 3.7, 3.19.x, ON, OFF, static)	1s
CMake Matrix Test. (MacOS Min, macos-11, clang, clang++, 3.7, 3.19.x, ON, OFF, shared)	1s
CMake Matrix Test. (Linux Max GCC, ubuntu-22.04, gcc-12, g++-12, 3.11, 3.22.x, ON, OFF, static)	12m 26s
CMake Matrix Test. (Linux Max GCC, ubuntu-22.04, gcc-12, g++-12, 3.11, 3.22.x, ON, OFF, shared)	12m 23s
CMake Matrix Test. (Linux SIMD, ubuntu-22.04, gcc-12, g++-12, 3.11, 3.22.x, OFF, ON, static)	12m 25s
CMake Matrix Test. (Linux SIMD, ubuntu-22.04, gcc-12, g++-12, 3.11, 3.22.x, OFF, ON, shared)	11m 45s
CMake Matrix Test. (Linux Max Clang, ubuntu-22.04, clang-14, clang++-14, 3.11, 3.22.x, ON, OFF, s...	12m 25s
CMake Matrix Test. (Linux Max Clang, ubuntu-22.04, clang-14, clang++-14, 3.11, 3.22.x, ON, OFF, s...	12m 9s
CMake Matrix Test. (MacOS Max, macos-13, clang, clang++, 3.11, 3.22.x, ON, OFF, static)	1m 29s
CMake Matrix Test. (MacOS Max, macos-13, clang, clang++, 3.11, 3.22.x, ON, OFF, shared)	5m 33s
	2h 9m 59s

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