Instructions
Stop any downloads occurring in the background of your Xbox. For example, stop any demo or add-on downloads while playing games or watching streaming television. Running a download will slow down the Xbox 360 browser.
Hard-wire your Xbox to your router instead of using wireless Internet. This will prevent any interference with other electronics. It will also prevent the router from kicking the Xbox off the Internet if the router stops working.
Run only one device on your wireless Internet at a time. This means if you are playing Xbox with a wireless router, do not run your computer or laptop at the same time. The less bandwidth other devices are using, the more bandwidth is available for your Xbox 360.