Summary variables calculated only when called #11107

Job	Run time
style	24s
Doctests (ubuntu-latest / Python 3.11)	3m 25s
Example notebooks (ubuntu-latest / Python 3.12)	16m 34s
Tests (ubuntu-latest / Python 3.9)	13m 9s
Tests (ubuntu-latest / Python 3.10)	14m 56s
Example scripts (ubuntu-latest / Python 3.12)	14m 4s
Tests (ubuntu-latest / Python 3.11)	14m 14s
Tests (ubuntu-latest / Python 3.12)	20m 58s
Tests (macos-13 / Python 3.9)	12m 15s
Tests (macos-13 / Python 3.10)	15m 34s
Tests (macos-13 / Python 3.11)	11m 31s
Tests (macos-13 / Python 3.12)	12m 51s
Tests (macos-14 / Python 3.9)	5m 26s
Tests (macos-14 / Python 3.10)	5m 14s
Tests (macos-14 / Python 3.11)	5m 21s
Tests (macos-14 / Python 3.12)	3m 37s
Tests (windows-latest / Python 3.9)	15m 56s
Tests (windows-latest / Python 3.10)	15m 8s
Tests (windows-latest / Python 3.11)	14m 26s
Tests (windows-latest / Python 3.12)	12m 41s
	3h 47m 44s

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