make sure that you have the latest quicktime version, using the quicktime updater located in the same folder as the quicktime player itself. Next, since i'm assuming that you're listening to streaming media off of the web, make sure that your connection speed is appropriate to the connection you have. you can configure this in the preference sub-menu under the "edit" menu when you're in the application. and lastly, you may want to try increasing the memory partition to the application itself, under the "get-info" command, and go to the "memory" setting sub-menu in that dialouge, and increase the memory in the 'preffered" memory box. hope that helps