Sadly now its actually worse. (is a bit like iPhones, the software gets slower but you don't notice as the hardware got faster if you stay on the upgrade train)
And with that said even Tesla can't get away from this, but its from their own doing. The 5+ year old cars have Atom CPU's for the infotainment which was zippy in the past but with new features being added. Those systems can't provide the parallel speeds now supplied on the new AMD CPU's and start to lose that instant feeling.
How do I know, I test drove that last batch of Model S's on the 2nd hand market in Australia and the gui is not fluid and it shows when the owners were frustrated using it themselves as well as they all wanted the latest model.