Your site doesn’t need to call the jQuery library to make AB Tasty work. Our program includes a version of jQuery by default to apply the changes to your pages. Therefore, you don’t have to use jQuery.
If you are already using jQuery, we will still load our own version in order to take advantage of the framework’s recent functions and updates. You can configure AB Tasty to not load its version of jQuery, and use yours instead. This will allow you to drop a few milliseconds off of your load time. To do this, go to your account settings, then in the "Library" tab, uncheck the "Add jQuery to my site" box. Important: in this case, the AB Tasty tag must be placed after your jQuery call in your pages’ source code.
AB Tasty works in synchronous and asynchronous mode. The call to AB Tasty’s library works in synchronous mode in order to apply the changes as quickly as possible. But all the information collection happens in asynchronous mode, because the immediacy of these processes doesn’t matter, as it does for the application of the changes.