The device will show no difference in performance after the jailbreak. Just as before, it will be possible to download multimedia content and applications from iTunes and use the iCloud functionality. After the jailbreak, only a Cydia icon appears on the device's home screen. If you want to know how to hide this icon, please read the article in the Help section of the control panel. A jailbreak does not affect the performance of the device, and often even extends the life of the battery.