Does your app use the -webkit-box-shadow property? If so, we have some known performance issues with this. Can you also give our latest beta 3 release a try to see if the performance is the same? If you continue to see problems, please open a new bug report at bugbase.adobe.com and provide some sample code and/or application so we can quickly reproduce the problem. If you'd like to keep this private, please feel free to send it to me directly (firstname.lastname@example.org).