Run:
> npm install
> time grunt
Results:
Running "browserify:dist" (browserify) task
>> Bundle js/index.js created.
Done, without errors.
real 0m6.742s
user 0m6.262s
sys 0m0.546s
Ouch! Likewise...
> time browserify index.js -o js/index.js -t [ babelify --presets [ es2015 ] ]
real 0m5.398s
user 0m5.025s
sys 0m0.431s
What about Babel-CLI?
> time node node_modules/babel-cli/bin/babel.js -o js/index.js --presets es2015 < index.js
real 0m5.462s
user 0m5.067s
sys 0m0.456s
Use NPM3! Flatter dependency trees = faster builds.