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Bench Oxc, Swc, and Babel Transformer

Summary

  • Transform: Oxc is 3x - 5x faster than SWC, uses 20% less memory, and has smaller package size (2 MB vs SWC's 37 MB).
  • Transform: Oxc is 20x - 50x faster than Babel, uses 70% less memory, and is 19 MB smaller, with only 2 npm packages to install vs Babel's 170.
  • React development + React Refresh: Oxc is 5x faster than SWC, 50x faster than Babel.
  • TS isolated declarations .d.ts emit: Oxc is 40x faster than TSC on typical files, 20x faster on larger files.

Transform / Transpile

Oxc is 3x - 5x faster than swc, and 20x - 50x faster than Babel.

React development + refresh is 6x faster than swc and 20x - 70x faster than Babel.

GitHub Actions ubuntu-latest

  oxc - src/transform.bench.ts > UserSettings.tsx (sourceMap: false, reactDev: false, target: esnext)
    4.18x faster than swc
    49.04x faster than babel
  oxc - src/transform.bench.ts > UserSettings.tsx (sourceMap: false, reactDev: false, target: es2015)
    5.71x faster than swc
    46.49x faster than babel
  oxc - src/transform.bench.ts > UserSettings.tsx (sourceMap: true, reactDev: false, target: esnext)
    4.23x faster than swc
    40.18x faster than babel
  oxc - src/transform.bench.ts > UserSettings.tsx (sourceMap: false, reactDev: true, target: esnext)
    5.41x faster than swc
    64.39x faster than babel
  oxc - src/transform.bench.ts > UserSettings.tsx (sourceMap: true, reactDev: true, target: esnext)
    5.17x faster than swc
    53.43x faster than babel
  oxc - src/transform.bench.ts > parser.ts (sourceMap: false, reactDev: false, target: esnext)
    3.13x faster than swc
    34.59x faster than babel
  oxc - src/transform.bench.ts > parser.ts (sourceMap: false, reactDev: false, target: es2015)
    3.51x faster than swc
    31.86x faster than babel
  oxc - src/transform.bench.ts > parser.ts (sourceMap: true, reactDev: false, target: esnext)
    3.03x faster than swc
    26.98x faster than babel
  oxc - src/transform.bench.ts > renderer.ts (sourceMap: false, reactDev: false, target: esnext)
    3.21x faster than swc
    23.76x faster than babel
  oxc - src/transform.bench.ts > renderer.ts (sourceMap: false, reactDev: false, target: es2015)
    3.62x faster than swc
    22.93x faster than babel
  oxc - src/transform.bench.ts > renderer.ts (sourceMap: true, reactDev: false, target: esnext)
    3.11x faster than swc
    18.77x faster than babel
  oxc - src/transform.bench.ts > table.tsx (sourceMap: false, reactDev: false, target: esnext)
    3.74x faster than swc
    30.57x faster than babel
  oxc - src/transform.bench.ts > table.tsx (sourceMap: false, reactDev: false, target: es2015)
    4.32x faster than swc
    30.96x faster than babel
  oxc - src/transform.bench.ts > table.tsx (sourceMap: true, reactDev: false, target: esnext)
    3.59x faster than swc
    26.30x faster than babel
  oxc - src/transform.bench.ts > table.tsx (sourceMap: false, reactDev: true, target: esnext)
    4.71x faster than swc
    46.03x faster than babel
  oxc - src/transform.bench.ts > table.tsx (sourceMap: true, reactDev: true, target: esnext)
    4.45x faster than swc
    37.05x faster than babel

Isolated Declarations DTS Emit

Oxc is 45x faster than tsc on ordinary files, and 20x faster on larger files.

GitHub Actions ubuntu-latest

oxc - src/id.bench.ts > UserSettings.tsx
  44.45x faster than tsc

oxc - src/id.bench.ts > parser.ts
  21.16x faster than tsc

oxc - src/id.bench.ts > renderer.ts
  21.70x faster than tsc

oxc - src/id.bench.ts > table.tsx
  7.99x faster than tsc

Memory Usage

On parser.ts by using /usr/bin/time -alh node:

Max RSS
oxc 57 MB
swc 74 MB
babel 180 MB

Package size

For package download size, oxc downloads 2 packages for around a total of 2MB.

Package Size
@oxc-transform/binding-darwin-arm64 1.95 MB
@swc/core-darwin-arm64 37.5 MB
@babel/core + @babel/preset-env + @babel/preset-react + @babel/preset-typescript 21MB and 170 packages

Fixtures

NOTE:

Babel's code generator deoptimised the styling for large files and reports:

[BABEL] Note: The code generator has deoptimised the styling of parser.ts as it exceeds the max of 500KB.

I intended to benchmark checker.ts from tsc, but Babel failed to parse:

TypeError: Duplicate declaration "SymbolLinks"
  1425 | }));
  1426 |
> 1427 | const SymbolLinks = class implements SymbolLinks {
       |       ^^^^^^^^^^^
  1428 |     declare _symbolLinksBrand: any;
  1429 | };
  1430 |