Reduce memory arena contention #550

Job	Run time
macOS 10.10 x86_64	21m 56s
macOS 10.13 x86_64	19m 17s
sdist	21s
macOS 10.15 x86_64	20m 54s
Windows x86	21m 44s
macOS arm64	19m 49s
Windows AMD64	33m 47s
manylinux2014 and musllinux x86_64	38m 21s
Windows ARM64	12m 10s
manylinux_2_28 x86_64	19m 28s
manylinux2014 and musllinux aarch64	33m 35s
manylinux_2_28 aarch64	19m 0s
Upload release to PyPI	0s
Upload wheels to scientific-python-nightly-wheels	0s
	4h 20m 22s

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