I have a newer model running 11 and an older model running 10. The 11 model is much faster than the 10 model
On identical hardware, I find that 11 runs applications at about the same speed at 10; slightly faster or slightly slower depending on the application. And actually that's pretty good, given that 11 has substantially improved security under the hood compared to 10.
Rant alert...
OTOH, navigating the UI dialogs is about 3x slower in both 10 and 11 compared to Win7. I can't stand to work with the 10/11 UI. The "Metro" UI introduced in Win8 was the worst mistake since Vista and its "Mother-May-I" UAC and pig-slow Aero graphics.
I pray for the day Microsoft comes to their senses and takes the desktop back to the Win7 or earlier UI, or at least offers it as an option. There was a time when you could select that, but they dropped the option with Win8 because You Will Use The UI We Give You. Fascists, bah. Bad as Apple, maybe worse, since Apple's UI at least works really well and they don't screw with it every release.
Sorry about the rant. :-)