lazy-dom@0.1.0 benchmark /home/runner/work/lazy-dom/lazy-dom/packages/lazy-dom pnpm build:wasm && tsx src/benchmark/benchmark.ts – –md

lazy-dom@0.1.0 build:wasm /home/runner/work/lazy-dom/lazy-dom/packages/lazy-dom asc src/assembly/index.ts –outFile build/wasm/lazy-dom.wasm –optimize –exportRuntime

Benchmarks

Generated on 2026-03-12

Node v22.22.0

linux x64

React

Benchmark	lazy-dom (ops/sec)	JSDOM (ops/sec)	Speedup
React.createRoot	0	5,092	0.0x
React.createRoot + React.createElement	6,079	6,470	0.9x
event handling	3,689	3,789	1.0x
React deep render (6 providers)	2,184	2,218	1.0x
React deep render + snapshot	2,147	2,168	1.0x
React deep render + rerender	1,827	1,843	1.0x

Testing Library

Benchmark	lazy-dom (ops/sec)	JSDOM (ops/sec)	Speedup
getByRole	310	318	1.0x

DOM

Benchmark	lazy-dom (ops/sec)	JSDOM (ops/sec)	Speedup
removing child	16,843	84,724	0.2x
childNodes[i] access	2,210	2,151	1.0x
childNodes.forEach	2,317	860	2.7x
childNodes.length	1,080	2,728	0.4x
Array.from(childNodes)	2,365	2,288	1.0x
getElementById (depth-5 tree)	633	618	1.0x
getElementsByTagNameNS (depth-5 tree)	594	568	1.0x
document.all (depth-5 tree)	0	559	0.0x
setAttribute x10 + read	18,638	18,158	1.0x
setAttribute x50 + read	5,036	5,107	1.0x
setAttribute x100 + read	2,632	2,636	1.0x
setAttribute overwrite x50	10,528	10,664	1.0x
textContent flat 100	2,384	2,364	1.0x
textContent deep 20	2,533	2,373	1.1x
textContent mixed 50	2,353	2,371	1.0x
bulk tree ~50 elements	933	903	1.0x
bulk tree ~100 elements	428	414	1.0x
bulk tree ~200 elements	222	223	1.0x

Serialization

Benchmark	lazy-dom (ops/sec)	JSDOM (ops/sec)	Speedup
outerHTML wide (100 children)	430	387	1.1x
outerHTML deep (20 levels)	1,795	1,809	1.0x
outerHTML realistic (~70 elements)	633	604	1.0x
innerHTML (50 spans)	887	899	1.0x