Drupal 6 has the awesome advagg module, which does an awesome job of intelligently bundling CSS and JS, but currently no D7 release.

What I am looking to achieve is:

  • less CSS and JS files (5 CSS and 5 JS files is far too many)
  • JS files have minification (currently core only does this for CSS)

Is there a drupal 7 solution that will help here? What are other people's experience with optimising this?

Edit: The question was originally posted in 2011. There is now a very stable D7 release of advagg.

2 Answers 2


For D7, there's Core Library which has a learning mode that aggregates based on real-world statistics about your site.

If you want to brute-force everything into one giant aggregate, I've written an article with some sample code:

 * Implements hook_js_alter().
function mymodule_js_alter(&$javascript) {
  uasort($javascript, 'drupal_sort_css_js');
  $i = 0;
  foreach ($javascript as $name => $script) {
    $javascript[$name]['weight'] = $i++;
    $javascript[$name]['group'] = JS_DEFAULT;
    $javascript[$name]['every_page'] = FALSE;

 * Implements hook_css_alter().
function mymodule_css_alter(&$css) {
  uasort($css, 'drupal_sort_css_js');
  $i = 0;
  foreach ($css as $name => $style) {
    $css[$name]['weight'] = $i++;
    $css[$name]['group'] = CSS_DEFAULT;
    $css[$name]['every_page'] = FALSE;

Drupal.org issue #1034208 also proposes relaxing the strict ordering requirements slightly.

  • The giant aggregate did not seem to produce the correct behaviour, it would indeed make 1 large CSS/JS file for page, but this file would change depending on the page you are on. This is obviously less than ideal.
    – wiifm
    Commented Feb 12, 2012 at 10:47
  • Exactly right, if each page loads different JS files, then the aggregate will necessarily be different. You've just rediscovered the reason Drupal 7 splits files into functional groups (JS_LIBRARY, JS_DEFAULT, and JS_THEME). With complex sites this is often more efficient than one giant file.
    – Dylan Tack
    Commented Feb 13, 2012 at 18:59
  • 1
    If there are 3 groups, how can there be 5 files loaded in the head? Why not never more than 3? Bundling everything in 1 file is apparently a horrible idea, but how to keep the JS files to a mimimum?
    – Rudie
    Commented May 14, 2013 at 19:05
  • i have tried the code that mentioned here. Actually it creating two compressed js files for me. How can I make it one js file?
    – Cool
    Commented Aug 18, 2014 at 11:57
  • @DylanTack one of my website has problem with loading css fiels [drupal.stackexchange.com/questions/128649/… and website address [living.md/] I was wandering where to put your code, and can i use your code along with advagg module ?
    – Yama
    Commented Sep 11, 2014 at 13:09

AdvAgg D7 is being developed. Other options (quotes included are from their project pages):

... allows on-the-fly minification of site JavaScript with uglify.js. The module relies on a web service (uglify.me) by default to do the minification so you do not need to do any pre-processing on your server to enjoy the benefits of minified JavaScript.

... designed to help speed up front end performance in a site. In this first release of the Speedy module it provides minified versions of core JavaScript files that are not already minified. For example, a minified version of drupal.js is provided while jquery.js (already minified) is not.


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