2016-11-08 20:26:29 +01:00
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These benchmarks are informal and only intended to give us a general sense of
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2016-08-19 22:02:33 +02:00
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the benefit Dart Sass could provide relative to other implementations.
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2016-07-16 00:26:10 +02:00
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2016-08-19 22:02:33 +02:00
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This was tested against:
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2019-07-12 02:53:36 +02:00
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* libsass 0f3d6ad1 and sassc 4674821 compiled with g++ (Debian 7.3.0-18) 7.3.0.
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* Dart Sass 088fc28 on Dart 2.4.0 and Node v12.0.0.
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2019-05-16 01:02:02 +02:00
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* Ruby Sass 8d1edc76 on ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-linux].
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2016-10-01 01:26:02 +02:00
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2018-06-15 20:29:42 +02:00
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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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2017-02-03 01:31:51 +01:00
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[application snapshot]: https://github.com/dart-lang/sdk/wiki/Snapshots
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2016-08-19 22:02:33 +02:00
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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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2018-09-17 23:30:19 +02:00
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* sassc: 0.004s
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2019-07-12 02:53:36 +02:00
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* Dart Sass from a script snapshot: 0.219s
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* Dart Sass native executable: 0.020s
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* Dart Sass on Node.js: 0.200s
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* Ruby Sass with a hot cache: 0.155s
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2018-06-15 20:29:42 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2018-06-15 20:29:42 +02:00
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2019-07-12 02:53:36 +02:00
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* 5.0x slower than libsass
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* 10.0x faster than Dart Sass on Node
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* 7.8x faster than Ruby Sass
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2016-08-19 22:02:33 +02:00
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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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2019-07-12 02:53:36 +02:00
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* sassc: 1.714s
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* Dart Sass from a script snapshot: 1.606s
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* Dart Sass native executable: 1.547s
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* Dart Sass on Node.js: 2.672s
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* Ruby Sass with a hot cache: 11.145s
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2016-08-19 22:02:33 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2018-09-17 23:30:19 +02:00
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2019-07-12 02:53:36 +02:00
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* 1.1x faster than libsass
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* 1.7x faster than Dart Sass on Node
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* 7.2x faster than Ruby Sass
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2016-08-19 22:02:33 +02:00
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## Preceding Sparse `@extend`
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2018-06-15 20:29:42 +02:00
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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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2016-08-19 22:02:33 +02:00
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2019-07-12 02:53:36 +02:00
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* sassc: 1.750s
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* Dart Sass from a script snapshot: 1.602s
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* Dart Sass native executable: 1.585s
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* Dart Sass on Node.js: 2.782s
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* Ruby Sass with a hot cache: 17.012s
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2016-08-19 22:02:33 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2016-08-19 22:02:33 +02:00
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2019-07-12 02:53:36 +02:00
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* 1.1x faster than libsass
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* 1.8x faster than Dart Sass on Node
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* 10.7x faster than Ruby Sass
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2016-08-19 22:02:33 +02:00
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## Following Sparse `@extend`
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2018-06-15 20:29:42 +02:00
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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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2016-08-19 22:02:33 +02:00
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2019-07-12 02:53:36 +02:00
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* sassc: 1.724s
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* Dart Sass from a script snapshot: 1.610s
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* Dart Sass native executable: 1.568s
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* Dart Sass on Node.js: 2.712s
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* Ruby Sass with a hot cache: 16.670s
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2016-08-19 22:02:33 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2018-09-17 23:30:19 +02:00
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2019-07-12 02:53:36 +02:00
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* 1.1x faster than libsass
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* 1.7x faster than Dart Sass on Node
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* 10.6x faster than Ruby Sass
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2016-08-19 22:02:33 +02:00
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## Preceding Dense `@extend`
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2018-06-15 20:29:42 +02:00
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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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2016-08-19 22:02:33 +02:00
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2019-07-12 02:53:36 +02:00
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* sassc: 2.290s
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* Dart Sass from a script snapshot: 2.476s
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* Dart Sass native executable: 2.566s
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* Dart Sass on Node.js: 5.399s
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* Ruby Sass with a hot cache: 29.002s
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2016-07-16 00:26:10 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2016-07-16 00:26:10 +02:00
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2019-07-12 02:53:36 +02:00
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* 1.1x slower 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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2016-08-19 22:02:33 +02:00
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## Following Dense `@extend`
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2018-06-15 20:29:42 +02:00
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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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2016-08-19 22:02:33 +02:00
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2019-07-12 02:53:36 +02:00
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* sassc: 2.317s
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* Dart Sass from a script snapshot: 2.381s
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* Dart Sass native executable: 2.461s
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* Dart Sass on Node.js: 5.481s
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* Ruby Sass with a hot cache: 29.197s
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2016-08-19 22:02:33 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2018-09-17 23:30:19 +02:00
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2019-05-16 01:02:02 +02:00
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* 1.1x slower than libsass
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2019-07-12 02:53:36 +02:00
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* 2.2x faster than Dart Sass on Node
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* 11.9x faster than Ruby Sass
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2018-09-17 23:30:19 +02:00
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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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2019-07-12 02:53:36 +02:00
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* sassc: 0.763s
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* Dart Sass from a script snapshot: 1.613s
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* Dart Sass native executable: 0.992s
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* Dart Sass on Node.js: 3.529s
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* Ruby Sass with a hot cache: 12.969s
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2018-09-17 23:30:19 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2018-09-17 23:30:19 +02:00
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2019-07-12 02:53:36 +02:00
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* 1.3x slower than libsass
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* 3.6x faster than Dart Sass on Node
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* 13.1x faster than Ruby Sass
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2018-09-17 23:30:19 +02:00
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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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2019-07-12 02:53:36 +02:00
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* sassc: 0.262s
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* Dart Sass from a script snapshot: 0.805s
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* Dart Sass native executable: 0.612s
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* Dart Sass on Node.js: 1.876s
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* Ruby Sass with a hot cache: 5.396s
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2018-09-17 23:30:19 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2018-09-17 23:30:19 +02:00
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2019-07-12 02:53:36 +02:00
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* 2.3x slower than libsass
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* 3.1x faster than Dart Sass on Node
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* 8.8x faster than Ruby Sass
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2018-09-17 23:30:19 +02:00
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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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2019-07-12 02:53:36 +02:00
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* sassc: 0.244s
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* Dart Sass from a script snapshot: 0.673s
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* Dart Sass native executable: 0.248s
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* Dart Sass on Node.js: 1.361s
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* Ruby Sass with a hot cache: 1.576s
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2018-09-17 23:30:19 +02:00
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2019-05-16 01:02:02 +02:00
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Based on these numbers, Dart Sass from a native executable is approximately:
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2018-09-17 23:30:19 +02:00
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2019-07-12 02:53:36 +02:00
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* identical to libsass
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* 5.5x faster than Dart Sass on Node
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* 6.4x faster than Ruby Sass
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2016-08-19 22:02:33 +02:00
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2018-06-15 20:29:42 +02:00
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# Prior Measurements
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2016-08-19 22:02:33 +02:00
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2019-07-12 02:53:36 +02:00
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* [1.20.2](https://github.com/sass/dart-sass/blob/4b7699291c9f69533d25980d23b0647266b665f2/perf.md).
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2019-05-16 01:02:02 +02:00
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* [1.13.4](https://github.com/sass/dart-sass/blob/b6ccc91a138e75420227ff79381c5f70e60254f1/perf.md).
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2018-09-17 23:30:19 +02:00
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* [1.6.0](https://github.com/sass/dart-sass/blob/048cbe197a77e1cf4b837a40a5acb737e949fd5c/perf.md).
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2018-06-15 20:29:42 +02:00
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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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2016-08-19 22:02:33 +02:00
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2018-06-15 20:29:42 +02:00
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# Conclusions
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2016-08-19 22:02:33 +02:00
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2019-05-16 01:02:02 +02:00
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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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