Big variance-related bug fix to xtrace #170

Job	Run time
Wheel build for cp39-manylinux x86_64	1m 46s
Wheel build for cp310-manylinux x86_64	1m 33s
Wheel build for cp311-manylinux x86_64	1m 32s
Wheel build for cp312-manylinux x86_64	1m 42s
Wheel build for cp313-manylinux x86_64	1m 32s
Wheel build for cp39-macosx x86_64	2m 21s
Wheel build for cp310-macosx x86_64	1m 54s
Wheel build for cp311-macosx x86_64	1m 47s
Wheel build for cp312-macosx x86_64	1m 57s
Wheel build for cp313-macosx x86_64	1m 50s
Wheel build for cp39-macosx arm64	1m 32s
Wheel build for cp310-macosx arm64	1m 16s
Wheel build for cp311-macosx arm64	1m 11s
Wheel build for cp312-macosx arm64	1m 29s
Wheel build for cp313-macosx arm64	1m 19s
Wheel build for cp39-win native	2m 56s
Wheel build for cp310-win native	2m 52s
Wheel build for cp311-win native	3m 23s
Wheel build for cp312-win native	2m 51s
Wheel build for cp313-win native	2m 42s
	39m 25s

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