minor itp speedups #403

Job	Run time
test (core, 1.10, ubuntu-latest)	16m 40s
test (core, 1.10, macos-latest)	23m 42s
test (core, 1.10, windows-latest)	27m 39s
downgrade (1.10, core)	18s
test (core, 1, ubuntu-latest)	25m 43s
downgrade (1.10, downstream)	18s
test (core, 1, macos-latest)	30m 8s
test (core, 1, windows-latest)	38m 44s
downgrade (1.10, wrappers)	16s
test (downstream, 1.10, ubuntu-latest)	11m 13s
test (downstream, 1.10, macos-latest)	8m 33s
test (downstream, 1.10, windows-latest)	15m 52s
test (downstream, 1, ubuntu-latest)	20m 36s
test (downstream, 1, macos-latest)	13m 50s
test (downstream, 1, windows-latest)	25m 6s
test (wrappers, 1.10, ubuntu-latest)	9m 11s
test (wrappers, 1.10, macos-latest)	5m 51s
test (wrappers, 1.10, windows-latest)	13m 5s
test (wrappers, 1, ubuntu-latest)	16m 23s
test (wrappers, 1, macos-latest)	10m 45s
test (wrappers, 1, windows-latest)	20m 7s
	5h 34m 0s

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