Visual Website Optimister has released their Asynchronous code out of beta and it is now the recommended serving method. The module has been updated such that new installs will use Asynchronous mode by default, but all existing installs will have to update the setting themselves. You can adjust the settings on your site at: http://YOURSITE/admin/settings/visual_website_optimizer/settings VWO Blog post about the subject is here. http://visualwebsiteoptimizer.com/split-testing-blog/asynchronous-code/ 6.x-1.2, 2012-03-24 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ by ELC: Pander to Drupal Code Sniffer. by ELC: Change default javascript loading mode to Async. by ELC: Update descriptions on new config options to reflect their purpose. Issue #1422772 by ELC: Add ability to set Account ID back to original NONE. by ELC: Asynchronous code now out of beta. Updated text to reflect non-beta status of Asynchronous javascript include. Additional configuration settings added. Re-arrange settings page.