async js/css load blocking the scripts

I am using newspaper theme for my news blog i.e http://www.tecake.com, that is quite heavy to load.
To optimize site’s performance, i had used so many plugins for asynchronous js,css load. My CDN also offers me the same feature. But the main problem is this async load is blocking scrips which is dropping the feature of homepage slider and mobile theme main menu.
I want to know how to exclude these scripts to be blocked. Currently i am using Asynchronous Java Script a wordpress plugin because it has a feature to exclude the scripts.
Don’t know what to exclude.
ThankYou!!