Mine hasn't frozen much. What I get is a very obvious lag (1/2 a second to a second) when touching any touchscreen buttons that's annoying when you're parked, and almost dangerous to use when driving because you have to look at your screen way too long or too often to see if it registered of I accidentally hit the wrong button or whatever. I have used the MFT system in other cars briefly, at the time I wasn't paying attention to slowness, but I don't remember it being super quick, but not also not abnormally slow. But the Sync3 system was touted as amazingly fast like a smartphone. I guess my Sync3 system is like my smartphone because my current smartphone sucks...but that's not how it's supposed to be. When my smartphone is working as it should the touch is registered immediately, not 1/2 a second to a second later.
One review I'm looking at says it has a capacitive touchscreen. As far as I can tell this is incorrect for my car. Capacitve touchscreens are made of glass like smartphones, tablets, and touchscreen laptops. Mine is a plastic matte screen that seems more like a resistive touchscreen. I don't claim to be the know all about touchscreen technology so maybe mine is capacitive, but it's not like a smartphone touchscreen... What material is you guys screens made out of? I have an early build 2016 so it's one of the first Fiestas with the Sync3 system. Maybe they revised the screen later?