mlv performance improvements

[mlv]

No description provided.

[codspeed-hq]

Merging this PR will improve performance by 56.48%

⚡ 2 improved benchmarks
✅ 4 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_bench_compute_histogram[baseline]	10.7 s	9.6 s	+11.23%
⚡	test_bench_compute_histogram[solution]	9.4 s	4.3 s	×2.2

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing mlv:mlv (62401b4) with main (72790a0)}