Note: Please test with yuicomboloading both enabled, and disabled. git clone https://github.com/yui/yui3-gallery.git copy a gallery module or two in to your intended victim (I used mod/assign) cp ~/git/yui/yui3-gallery/build/gallery-sm-menu-* mod/assign/yui/gallery/build/ purge caches open any page in Moodle and open the developer tools open the Network tab, and clear anything that's there switch to the console (or press escape in Chrome) run: YUI().use('gallery-sm-menu'); Confirm that : The JS for the module was loaded from the correct source The file content for each loaded file was present Any relevant CSS was loaded too Now load gallery-sm-treeview to confirm we didn't break anything: YUI().use('gallery-sm-treeview'); Confirm that : The JS for the module was loaded from the correct source The file content for each loaded file was present Any relevant CSS was loaded too Add some meta-data to the modules you included: for d in mod/assign/yui/gallery/build/gallery-sm-menu-*; do cp ~/git/yui/yui3-gallery/src/gallery-sm-menu/meta/sm-menu.json "$d"/meta.json Purge Moodle caches Reload the sm-menu gallery module YUI().use('gallery-sm-menu'); Confirm that: The module was loaded again, but this time with fewer requests (only if yuicombloading = true) Any relevant CSS was loaded too