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| author | kzc <kzc@users.noreply.github.com> | 2017-07-02 13:37:04 -0400 |
|---|---|---|
| committer | Alex Lam S.L <alexlamsl@gmail.com> | 2017-07-03 01:37:04 +0800 |
| commit | f3a487a36829eabc7b2d878eba299f7d97d830e0 (patch) | |
| tree | 1fd590c27fbee6892476b9b691771d1bc0242849 /README.md | |
| parent | 2dde41615a22ec16b52028a5b09a42b50e4ee094 (diff) | |
| download | tracifyjs-f3a487a36829eabc7b2d878eba299f7d97d830e0.tar.gz tracifyjs-f3a487a36829eabc7b2d878eba299f7d97d830e0.zip | |
document fast mangle-only minify mode (#2194)
Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 26 |
1 files changed, 26 insertions, 0 deletions
@@ -1026,3 +1026,29 @@ in total it's a bit more than just using UglifyJS's own parser. [acorn]: https://github.com/ternjs/acorn [sm-spec]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k + +### Uglify Fast Minify Mode + +It's not well known, but variable and function name mangling accounts for +95% of the size reduction in minified code for most javascript - not +elaborate code transforms. One can simply disable `compress` to speed up +Uglify builds by 3 to 4 times. In this fast `mangle`-only mode Uglify has +comparable minify speeds and gzip sizes to +[`butternut`](https://www.npmjs.com/package/butternut): + +| d3.js | minify size | gzip size | minify time (seconds) | +| --- | ---: | ---: | ---: | +| original | 451,131 | 108,733 | - | +| uglify-js@3.0.23 mangle=false, compress=false | 316,600 | 85,245 | 0.73 | +| uglify-js@3.0.23 mangle=true, compress=false | 220,216 | 72,730 | 1.21 | +| Butternut 0.4.6 | 217,568 | 72,738 | 1.81 | +| uglify-js@3.0.23 mangle=true, compress=true | 212,511 | 71,560 | 4.64 | + +To enable fast minify mode from the CLI use: +``` +uglifyjs file.js -m +``` +To enable fast minify mode with the API use: +```js +UglifyJS.minify(code, { compress: false, mangle: true }); +``` |