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PostCSS Benchmarks

Various benchmarks to have feedback about PostCSS perfomance.

All results below was run on Node 19.2.0, GitHub Actions:

Preprocessors

Compare CSS processors for parsings, nested rules, mixins, variables and math:

PostCSS sync:   74 ms  (1.1 times faster)
PostCSS:        78 ms
LibSass sync:   110 ms (1.4 times slower)
LibSass:        112 ms (1.4 times slower)
Less:           140 ms (1.8 times slower)
Dart Sass sync: 197 ms (2.5 times slower)
Dart Sass:      376 ms (4.8 times slower)

To get results on your environment:

pnpm install
pnpm test preprocessors

Parsers

Compare CSS parsers written on JS:

Stylis:       14 ms  (2.3 times faster)
CSSOM:        22 ms  (1.5 times faster)
CSSTree:      31 ms  (1.1 times faster)
PostCSS:      33 ms
Mensch:       33 ms  (1.0 times slower)
Rework:       51 ms  (1.5 times slower)
Stylecow:     66 ms  (2.0 times slower)
PostCSS Full: 93 ms  (2.8 times slower)
ParserLib:    141 ms (4.2 times slower)
Gonzales:     159 ms (4.8 times slower)

To get results on your environment:

pnpm install
pnpm test parsers

Prefixers

Compare vendor prefixes tools:

Lightning CSS: 12 ms  (7.9 times faster)
Stylis:        18 ms  (5.2 times faster)
Autoprefixer:  94 ms
Stylecow:      835 ms (8.9 times slower)

To get results on your environment:

pnpm install
pnpm test prefixers