zod 4.6.5 vs valibot 1.5.0 on one nested user schema (uuid/email/age/tags/profile/enum). Warm medians after 2k warmup + 9×50k: zod.parse 1,144,494 ops/s vs valibot.parse 968,187 (~1.18×). safeParse fail: valibot 697,760 vs zod 415,523 (~1.7×). esbuild minify+gzip9: 452,999/92,636 B vs 85,126/15,422 B. Package trees ~6.1 MB vs ~1.9 MB. Fixture /workspace/bench-zod-valibot/.
sharp 0.35.5 vs imagemin 9.0.1 + imagemin-mozjpeg 10.0.0 on one 1920×1080 JPEG → JPEG q80 (no resize). Warm medians (7 rounds after 1 warm-up): sharp 305 ms / 546,546 B vs imagemin-mozjpeg 399 ms / 675,128 B (~1.3×). Context: sharp resize 800 q80 median 115 ms / 142,435 B. Fixture /workspace/bench-sharp-imagemin/.
svgo 4.1.0 vs @svgr/core 8.1.0 on 20 verbose 128×128 SVGs (18,990 B). Warm medians (7 rounds after 1 warm-up): SVGO 34 ms / 12,410 B; SVGR JSX 35 ms / 17,620 B; SVGR+plugin-svgo 63 ms / 12,920 B. Fixture /workspace/bench-svgo-svgr/.
UnoCSS 66.5.2 (presetWind3) vs Tailwind CSS 4.1.13 (@tailwindcss/vite) on Vite 7.3.6: 80 HTML cards, same utility set, minify off. CSS 10,454 B (118 selectors) vs 18,473 B (119). Warm vite build medians (7 rounds, cache cleared): Uno 749 ms vs Tailwind 416 ms. Fixture /workspace/bench-unocss-tw/.
Playwright 1.55.1 Chromium vs Cypress 14.5.4 Electron on one local smoke (visit /, assert h1, click, assert). Warm medians (7 rounds after 1 warm-up): Playwright 1,466 ms vs Cypress 4,243 ms (~2.9x). Disk: PW node_modules ~12 MB + cache ~918 MB; Cypress node_modules ~23 MB + cache ~601 MB. Fixture /workspace/bench-pw-cy/.
bun test 1.4.2 vs Vitest 5.0.3 on 300 TypeScript tests in 60 files: warm wall medians 136 ms vs 1,673 ms (~12x); Vitest --no-isolate 765 ms (~5.6x). A 5-file vitest-API check (vi.fn, vi.mock, fake timers, spyOn, it.each, snapshot) passed 7/7 under Bun.
esbuild-register 3.6.0 vs jiti 2.7.0 on a 61-file TypeScript graph: cold wall medians 343 ms vs 540 ms (~1.57x); after jiti disk cache warm, 185 ms vs esbuild-register 350 ms. Same printed result 970.
nock 14.0.17 vs msw 2.15.0 on 2,000 sequential mocked fetch calls in Node 20: 2.85 ms vs 0.49 ms per request (~5.8x); via axios 3.80 ms vs 1.41 ms (~2.7x). nock sets up faster (97 vs 208 ms), crossover near 50 requests per process.
Turbo 2.11.7 vs Nx 23.2.1 on 7 packages / 336 JS files: cold median 1177 ms vs 3378 ms (~2.9x). Warm both 7/7 local cache hits (Turbo wall ~138 ms / tool ~16 ms; Nx wall ~668 ms with daemon / tool ~31 ms).
dprint 0.60.1 vs Prettier 3.9.9 on 180 files (120 JS + 40 JSON + 20 MD, 38925 B pristine): write medians 514 ms vs 1586 ms; check 455 ms vs 1313 ms. Output 44805 vs 45285 B. All 120 JS files differed on arrow-param parentheses under these defaults.
Lightning CSS 1.33.0 vs PostCSS 8.5.29 + Autoprefixer 10.6.1 + cssnano 6.1.2 on a 76,864-byte CSS fixture: medians 3.16 ms vs 105.75 ms (~33x). Outputs 70498 vs 68474 B. Leave Autoprefixer+cssnano-only stacks for Lightning; keep PostCSS for plugins Lightning does not replace.
Biome 2.5.15 check vs ESLint 9.39.4 + Prettier 3.8.4 on react-hook-form (317 files): 0.41 s vs 18.7 s sequential stack (ESLint 13.58 s, Prettier check 5.22 s). migrate eslint: 54/476 direct, ~50% covered. Biome 200 errors/427 warnings vs ESLint 0/562; 9 format diffs; 287 noExplicitAny from recommended.