My previous ride was a 2012 Jaguar XF supercharged. The GPS system wasn't laggy, it was glacial- as in unusable. Each part of an address accessed its hard drive to try to predict your input. Say you want 1143 Joe Blow ave. Type the first "1", and after a 5 second pause while it accessed its "database" for the thousands of addresses beginning with that number, showing the first 5 on the screen. Type the second "1" and it would do the same 5 second pause while it whittled the list down...and so forth. God forbid the address was in a different state, because that required a completely different database which was buried about 5 submenus down in a completely different area. Took me a couple months (really!) of frustration to find it. The couple of times I took the time to actually enter a location I got a pop-up telling me the roads weren't on the map! Owner's manual- worthless. Whoever programmed that crap was working on an emulator about 10,000 times faster than the processor in the car.
So, coming from that system- the NAV on the Ford is a wonder!