It combines (I think) javascript & async's them so that they are the last to load.
http://blog.cloudflare.com/56590463
Rocket Loader™ (Web optimization)/ Beta
Automatically asynchronously load all JavaScript resources.
Learn more…
This feature is currently in beta! Please help us out by submitting bug reports related to this feature here.
http://support.cloudflare.com/cgi/kb...et-loadertm-do
Quote:
Originally Posted by What does Rocket Loader™ do?
Rocket Loader is a general-purpose asynchronous JavaScript loader coupled with a lightweight virtual browser which can safely run any JavaScript code after window.onload. In other words, it turns a page which takes 12 seconds to load into a page which takes 2 seconds to load.
Recently, Google Improved AdSense so Google Ads no longer slows down your pages. What Google did is similar to what Rocket Loader does, except Rocket Loader does it for anything - ads, social media widgets, video players, even your own JavaScript code.
Turning on Rocket Loader will immediately improve a web page's window.onload time (assuming there is JavaScript on the page), which can have a positive impact on your Google search ranking.
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