The new operating system iOS 10 supports all iPhones, iPads and iPods that iOS 9 with the sole exception of the iPhone 4s. Popular YouTube channel EverythingApplePro has amazing comparison between all iPhones compared with iOS 9 and iOS 10.
The following video you can see for yourself what is the speed of the new and the current operating system, and as you can see, in fact, the difference is negligible for now, and even find a few functions where the current iOS 9 faster than iOS 10. It is however very important to note the 10 iOS is currently the first beta test version and the individual is to launch the final version to the public what is usually refers to the speed varies.
Speed is probably not improve dramatically, however, when the first beta version of iOS 10 as fast as iOS 9, it is likely that the final version will be slightly faster than iOS ninth Look at the test iOS iOS versus 10 9 the following video.