# Ember CLI takes 34 seconds to build on OSX SSD

**URL:** <https://discuss.emberjs.com/t/ember-cli-takes-34-seconds-to-build-on-osx-ssd/7896>\
**Category:** Ember CLI\
**Created:** [April 30, 2015, 11:30am UTC](https://discuss.emberjs.com/t/ember-cli-takes-34-seconds-to-build-on-osx-ssd/7896 "2015-04-30T11:30:05Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ivanvotti](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.emberjs.com/ivanvotti/32/305_2.png) [@ivanvotti](https://discuss.emberjs.com/u/ivanvotti)\
**Post date:** [April 30, 2015, 11:30am UTC](https://discuss.emberjs.com/t/ember-cli-takes-34-seconds-to-build-on-osx-ssd/7896/1 "2015-04-30T11:30:05Z")

</div>

Does anyone have any idea why it’s so slow and if there’s any way to make it faster?

The `app/` directory contents 286 `.js` files.

**First build** : 34 seconds

**Incremental build** : 6 seconds

Computer configuration:

```auto
OS X Yosemite 10.10.3
2.7 GHz Intel Core i7 (2 cores)
8 Gb Ram
SSD disk

```

```auto
$ ember -v
version: 0.2.3
node: 0.12.1
npm: 2.7.6

```

```auto
$ ember server
version: 0.2.3
Livereload server on port 35729
Serving on http://localhost:4200/

Build successful - 34313ms.

Slowest Trees | Total
----------------------------------------------+---------------------
Babel | 10764ms
Concat: Vendor | 4180ms
JSHint app- QUnit | 3489ms
Babel | 3281ms
ES6: App Tree | 2446ms
StylusCompiler | 1779ms

Slowest Trees (cumulative) | Total (avg)
----------------------------------------------+---------------------
Babel (6) | 15919ms (2653 ms)
Concat: Vendor (1) | 4180ms
JSHint app- QUnit (1) | 3489ms
ES6: App Tree (1) | 2446ms
StylusCompiler (1) | 1779ms

```

Incremental build:

```auto
Build successful - 6169ms.

Slowest Trees | Total
----------------------------------------------+---------------------
StylusCompiler | 1142ms
ES6: App Tree | 795ms
Funnel: App JS Files | 730ms
Concat: App | 637ms
Concat: Vendor | 457ms
Babel | 317ms

Slowest Trees (cumulative) | Total (avg)
----------------------------------------------+---------------------
StylusCompiler (1) | 1142ms
ES6: App Tree (1) | 795ms
Funnel: App JS Files (1) | 730ms
Concat: App (1) | 637ms
Concat: Vendor (1) | 457ms
Babel (6) | 417ms (69 ms)

```