chore: optimize compute_smooth_weight #10221

Job	Run time
Test Python (1, 3.9)	27m 51s
Test Python (1, 3.12)	41m 29s
Test Python (2, 3.9)	28m 35s
Test Python (2, 3.12)	36m 45s
Test Python (3, 3.9)	28m 1s
Test Python (3, 3.12)	38m 31s
Test Python (4, 3.9)	27m 59s
Test Python (4, 3.12)	37m 42s
Test Python (5, 3.9)	28m 15s
Test Python (5, 3.12)	36m 44s
Test Python (6, 3.9)	29m 20s
Test Python (6, 3.12)	38m 42s
Combine and update integration test durations (3.9)	6s
Combine and update integration test durations (3.12)	6s
Pass testing Python	2s
	6h 40m 8s

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