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189 lines
6.2 KiB
Markdown
189 lines
6.2 KiB
Markdown
These benchmarks are informal and only intended to give us a general sense of
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the benefit Dart Sass could provide relative to other implementations.
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This was tested against:
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* libsass 8d220b74 and sassc 3f84e23 compiled with g++ (Debian 7.3.0-18) 7.3.0.
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* Dart Sass 2868ab3 on Dart 2.3.0 and Node v11.14.0.
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* Ruby Sass 8d1edc76 on ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-linux].
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on Debian x64 with Intel Xeon E5-1650 v3 @ 3.50GHz. The Dart Sass
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[application snapshot][] was trained on the `tool/app-snapshot-input.scss` file.
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[application snapshot]: https://github.com/dart-lang/sdk/wiki/Snapshots
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# Measurements
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I ran five instances of each configuration and recorded the fastest time.
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## Small Plain CSS
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Running on a file containing 4 instances of `.foo {a: b}`:
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* sassc: 0.004s
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* Dart Sass from a script snapshot: 0.188s
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* Dart Sass native executable: 0.014s
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* Dart Sass on Node.js: 0.169s
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* Ruby Sass with a hot cache: 0.151s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 3.5x slower than libsass
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* 12.1x faster than Dart Sass on Node
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* 10.8x faster than Ruby Sass
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## Large Plain CSS
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Running on a file containing 2^17 instances of `.foo {a: b}`:
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* sassc: 1.909s
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* Dart Sass from a script snapshot: 1.586s
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* Dart Sass native executable: 1.438s
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* Dart Sass on Node.js: 3.028s
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* Ruby Sass with a hot cache: 10.772s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.3x faster than libsass
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* 2.1x faster than Dart Sass on Node
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* 7.5x faster than Ruby Sass
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## Preceding Sparse `@extend`
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Running on a file containing `.x {@extend .y}`, 2^17 instances of `.foo {a: b}`, and then `.y {a: b}`:
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* sassc: 2.007s
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* Dart Sass from a script snapshot: 1.617s
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* Dart Sass native executable: 1.457s
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* Dart Sass on Node.js: 3.072s
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* Ruby Sass with a hot cache: 16.456s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.4x faster than libsass
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* 2.1x faster than Dart Sass on Node
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* 11.3x faster than Ruby Sass
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## Following Sparse `@extend`
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Running on a file containing `.y {a: b}`, 2^17 instances of `.foo {a: b}`, and then `.x {@extend .y}`:
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* sassc: 1.934s
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* Dart Sass from a script snapshot: 1.594s
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* Dart Sass native executable: 1.433s
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* Dart Sass on Node.js: 3.099s
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* Ruby Sass with a hot cache: 16.497s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.3x faster than libsass
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* 2.2x faster than Dart Sass on Node
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* 11.5x faster than Ruby Sass
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## Preceding Dense `@extend`
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Running on a file containing `.bar {@extend .foo}` followed by 2^17 instances of `.foo {a: b}`:
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* sassc: 2.033s
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* Dart Sass from a script snapshot: 2.380s
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* Dart Sass native executable: 2.398s
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* Dart Sass on Node.js: 6.523s
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* Ruby Sass with a hot cache: 29.717s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.2x slower than libsass
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* 2.7x faster than Dart Sass on Node
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* 12.4x faster than Ruby Sass
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## Following Dense `@extend`
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Running on a file containing 2^17 instances of `.foo {a: b}` followed by `.bar {@extend .foo}`:
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* sassc: 2.065s
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* Dart Sass from a script snapshot: 2.312s
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* Dart Sass native executable: 2.256s
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* Dart Sass on Node.js: 6.760s
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* Ruby Sass with a hot cache: 28.755s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.1x slower than libsass
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* 3.0x faster than Dart Sass on Node
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* 12.7x faster than Ruby Sass
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## Bootstrap
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Running on a file containing 16 instances of importing the Bootstrap framework:
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* sassc: 0.898s
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* Dart Sass from a script snapshot: 1.550s
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* Dart Sass native executable: 0.907s
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* Dart Sass on Node.js: 3.559s
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* Ruby Sass with a hot cache: 12.649s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* identical to libsass
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* 3.9x faster than Dart Sass on Node
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* 13.9x faster than Ruby Sass
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## a11ycolor
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Running on a file containing test cases for a computation-intensive color-processing library:
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* sassc: 0.332s
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* Dart Sass from a script snapshot: 0.726s
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* Dart Sass native executable: 0.564s
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* Dart Sass on Node.js: 2.027s
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* Ruby Sass with a hot cache: 5.020s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.7x slower than libsass
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* 3.6x faster than Dart Sass on Node
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* 8.9x faster than Ruby Sass
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## Susy
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Running on a file containing test cases for the computation-intensive Susy grid framework:
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* sassc: 0.290s
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* Dart Sass from a script snapshot: 0.649s
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* Dart Sass native executable: 0.225s
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* Dart Sass on Node.js: 1.293s
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* Ruby Sass with a hot cache: 1.506s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.3x faster than libsass
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* 5.7x faster than Dart Sass on Node
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* 6.7x faster than Ruby Sass
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# Prior Measurements
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* [1.13.4](https://github.com/sass/dart-sass/blob/b6ccc91a138e75420227ff79381c5f70e60254f1/perf.md).
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* [1.6.0](https://github.com/sass/dart-sass/blob/048cbe197a77e1cf4b837a40a5acb737e949fd5c/perf.md).
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* [1.0.0-alpha.8](https://github.com/sass/dart-sass/blob/be44245a849f2bb18b5ca1fc74f3043a36da17f0/perf.md).
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* [Pre-alpha, 30 September 2016](https://github.com/sass/dart-sass/blob/169370bf18fd01d0618b0fc00d9db33e2fc52aa7/perf.md).
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* [Pre-alpha, 19 August 2016](https://github.com/sass/dart-sass/blob/4bea13cfe57d9e3c7f1f8580b80c59abe1cfabf8/perf.md).
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* [Pre-alpha, 15 July 2016](https://github.com/sass/dart-sass/blob/a3e00059c4371bfde9afada1759d8484aee05584/perf.md).
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# Conclusions
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This is the first measurement with Dart Sass running as ahead-of-time-compiled
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native code, and the results are encouraging. It's well below the 100ms
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threshold for tiny files, and it's on par with SassC for most test cases. SassC
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still leads for tests with many extends, although only slightly, and for one of
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our real-world test cases (although Dart Sass leads in others). The two
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implementations can be fairly described as having about the same performance
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overall.
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Dart Sass on Node is still substantially slower than on the Dart VM, and that
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relative slowdown becomes more pronounced as the raw Dart code becomes faster.
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Solutions for this such as [the embedded protocol][] or [WebAssembly support][]
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are becoming more and more important.
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[embedded Dart Sass]: https://github.com/sass/sass-embedded-protocol
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[Dart WebAssembly support]: https://github.com/dart-lang/sdk/issues/32894
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