Benchmark

ENVIRONMENT AND METHOD

Node.js 24.12.0 (LTS) • MacBook Pro M2 (2023, Sequoia 15.1) • 16GB RAM.

Warm up runs, then each script is executed 20 times, and we keep the median time. To minimize garbage collection and cross‑benchmark interference, all scenarios are run individually. All benchmark scripts are included so you can reproduce the results locally.

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LIST DIFF

Scenario	Superdiff	arr-diff	deep-diff
10k items array	1.84 ms	32.95 ms	4.74 ms
100k items array	17.43 ms	3363.15 ms	50.36 ms

OBJECT DIFF

Scenario	superdiff	deep-object-diff	deep-diff	microdiff
10k flat object keys	2.27 ms	2.44 ms	39.37 ms	2.24 ms
100k flat object keys	29.23 ms	31.86 ms	3784.50 ms	29.51 ms
100k nested nodes	4.25 ms	9.67 ms	16.51 ms	7.26 ms

TEXT DIFF

Scenario	superdiff	diff
10k words	1.32 ms	3.86 ms
100k words	12.09 ms	45.64 ms
10k sentences	1.58 ms	4.53 ms
100k sentences	22.31 ms	55.60 ms

^{(Superdiff uses its normal accuracy settings to match diff's behavior)}

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CODE DIFF

Scenario	superdiff	diff
1k lines	0.36 ms	1.14 ms
10k lines	9.55 ms	67.21 ms
100k lines	911.80 ms	6995.84 ms

^{Superdiff uses its normal accuracy settings to match diff's behavior}

👉 Despite providing a full structural diff with a richer output, Superdiff consistently matches or outperforms the fastest alternatives tested. It also scales linearly, even with deeply nested data.