Summary variables calculated only when called #11111

Job	Run time
style	33s
Example notebooks (ubuntu-latest / Python 3.12)	19m 16s
Doctests (ubuntu-latest / Python 3.11)	3m 26s
Example scripts (ubuntu-latest / Python 3.12)	13m 9s
Tests (ubuntu-latest / Python 3.9)	30m 16s
Tests (ubuntu-latest / Python 3.10)	29m 44s
Tests (ubuntu-latest / Python 3.11)	27m 50s
Tests (ubuntu-latest / Python 3.12)	34m 29s
Tests (macos-13 / Python 3.9)	28m 42s
Tests (macos-13 / Python 3.10)	34m 17s
Tests (macos-13 / Python 3.11)	28m 24s
Tests (macos-13 / Python 3.12)	31m 14s
Tests (macos-14 / Python 3.9)	14m 0s
Tests (macos-14 / Python 3.10)	14m 3s
Tests (macos-14 / Python 3.11)	13m 48s
Tests (macos-14 / Python 3.12)	8m 20s
Tests (windows-latest / Python 3.9)	33m 20s
Tests (windows-latest / Python 3.10)	31m 50s
Tests (windows-latest / Python 3.11)	30m 11s
Tests (windows-latest / Python 3.12)	28m 6s
	7h 34m 58s

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