Intersection speedup and refactor #278

Job	Run time
run-test-performance-base (ubuntu-latest)	4m 8s
run-test-performance (ubuntu-latest)	4m 58s
run-test-performance-base (macos-latest)	6m 22s
run-test-performance (macos-latest)	6m 39s
run-tests (ubuntu-latest)	4m 45s
warnings-base (ubuntu-latest)	3m 8s
warnings-new (ubuntu-latest)	3m 10s
run-tests (macos-latest)	3m 58s
warnings-base (macos-latest)	3m 33s
warnings-new (macos-latest)	2m 4s
compare-versions (ubuntu-latest)	8s
compare-versions (macos-latest)	7s
code-coverage	2m 58s
compare-performance (ubuntu-latest)	22s
compare-performance (macos-latest)	26s
	46m 46s

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