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183 lines
6.2 KiB
Markdown
183 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 006bbf5 and sassc 66f0ef3 compiled with g++ (Debian 11.2.0-10) 11.2.0.
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* Dart Sass 4fa365a on Dart 2.15.0 (stable) (Fri Dec 3 14:23:23 2021 +0100) on "linux_x64" and Node v16.10.0.
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on Debian x64 with Intel Core i7-8650U CPU @ 1.90GHz.
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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: 0.003s
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* Dart Sass from a script snapshot: 0.327s
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* Dart Sass native executable: 0.011s
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* Dart Sass on Node.js: 0.281s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 3.7x slower than libsass
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* 25.5x faster than Dart Sass on Node
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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: 1.769s
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* Dart Sass from a script snapshot: 2.061s
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* Dart Sass native executable: 1.666s
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* Dart Sass on Node.js: 3.913s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.1x faster than libsass
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* 2.3x faster than Dart Sass on Node
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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: 1.846s
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* Dart Sass from a script snapshot: 2.218s
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* Dart Sass native executable: 1.726s
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* Dart Sass on Node.js: 4.176s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.1x faster than libsass
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* 2.4x faster than Dart Sass on Node
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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: 1.778s
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* Dart Sass from a script snapshot: 2.058s
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* Dart Sass native executable: 2.152s
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* Dart Sass on Node.js: 4.231s
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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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* 2.0x faster than Dart Sass on Node
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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: 2.393s
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* Dart Sass from a script snapshot: 2.981s
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* Dart Sass native executable: 2.942s
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* Dart Sass on Node.js: 9.858s
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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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* 3.4x faster than Dart Sass on Node
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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: 2.685s
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* Dart Sass from a script snapshot: 3.838s
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* Dart Sass native executable: 3.033s
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* Dart Sass on Node.js: 9.527s
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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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* 3.1x faster than Dart Sass on Node
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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: 0.891s
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* Dart Sass from a script snapshot: 2.041s
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* Dart Sass native executable: 0.787s
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* Dart Sass on Node.js: 4.218s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.1x faster than libsass
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* 5.4x faster than Dart Sass on Node
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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: 0.387s
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* Dart Sass from a script snapshot: 0.970s
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* Dart Sass native executable: 0.367s
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* Dart Sass on Node.js: 1.409s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.1x faster than libsass
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* 3.8x faster than Dart Sass on Node
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## Duomo
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Running on a file containing the output of the numerically-intensive Duomo framework (skipping LibSass due to module system use):
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* Dart Sass from a script snapshot: 3.946s
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* Dart Sass native executable: 2.169s
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* Dart Sass on Node.js: 7.108s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 3.3x faster than Dart Sass on Node
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## Carbon
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Running on a file containing the output of the import-intensive Carbon framework:
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* sassc: 9.373s
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* Dart Sass from a script snapshot: 7.454s
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* Dart Sass native executable: 7.537s
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* Dart Sass on Node.js: 25.790s
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Based on these numbers, Dart Sass from a native executable is approximately:
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* 1.2x faster than libsass
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* 3.4x faster than Dart Sass on Node
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# Prior Measurements
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* [1.22.6](https://github.com/sass/dart-sass/blob/eec6ccc9d96fdb5dd30122a0c824efe8a6bfd168/perf.md).
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* [1.22.5](https://github.com/sass/dart-sass/blob/ed73c2c053435703cfbee8709f0dfb110cd31487/perf.md).
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* [1.22.4](https://github.com/sass/dart-sass/blob/a7172a2b1dd48b339e5d57159ed364ffb9f5812e/perf.md).
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* [1.20.2](https://github.com/sass/dart-sass/blob/4b7699291c9f69533d25980d23b0647266b665f2/perf.md).
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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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[the embedded protocol]: https://github.com/sass/sass-embedded-protocol
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[WebAssembly support]: https://github.com/dart-lang/sdk/issues/32894
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