Since day one I have had issues with choppy video in Silverlight with both Netflix and Amazon streaming video. I have a MB Pro 2012 with plenty under the hood. Decided to try it in Bootcamp with Windows 7 and the playback was flawless. Yes, on the exact same machine. This automatically rules out internet connection, slow server, bad router, etc. I really don't want to reboot my machine out of OSX every time I want to stream a movie. Any ideas? Hating Microsoft, Paul Edit: After a complete uninstall and reinstall, in firefox I have now achieved smooth video out of fullscreen mode. It is still choppy in fullscreen. Safari is smooth in both. I would rather use firefox, but can live with this.