Before talking about Rocket Loader feature let us understand why a lot of sites are slow, is it a problem in hosting? Or something else!
What Rocket Loader offers to speed the site?
Decreasing the connections (Requests) to the site
Asynchronous loading of the site contents
Compressing the content GZIP
Improve browsers cache
Usually all today browsers contains a cache for storing static files or according to what is written in the header file, this is done automatically. CloudFlare modifies the cache instructions and expiry of some files especially the static ones so the browser can store it in a smarter way.
Improve mobile browsing
Today mobile browsing became an important thing for all websites especially for news sites, social sites in addition to blogs, however we still see most websites is slow when browsed by mobile for many reasons such as the design and others. CloudFlare helps your site for faster and better browsing by mobile, it gets the mobile information such as the mobile type, the screen size and the browser and accordingly it sorts the data while sending it to the mobile’s browser for faster browsing.
How it is activated?
All the features that Rocket Loader provides to your site does not need any programming modifications for your site, all things is done on-the-fly all what you have to do is activating the feature, note that it is activaed by default.