chore: optimize compute_smooth_weight #3463

Job	Run time
Test Python (1, 3.9)	28m 24s
Test Python (1, 3.12)	40m 40s
Test Python (2, 3.9)	29m 15s
Test Python (2, 3.12)	37m 46s
Test Python (3, 3.9)	28m 54s
Test Python (3, 3.12)	37m 5s
Test Python (4, 3.9)	28m 50s
Test Python (4, 3.12)	38m 2s
Test Python (5, 3.9)	29m 9s
Test Python (5, 3.12)	37m 29s
Test Python (6, 3.9)	28m 28s
Test Python (6, 3.12)	40m 59s
Combine and update integration test durations (3.9)	9s
Combine and update integration test durations (3.12)	6s
Pass testing Python	2s
	6h 45m 18s

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