The firmware changed the layout for the improved interface for Netflix. This may cause a slightly longer load time when the App is launched, but there shouldn't be a significant change in retrieving movies from the service itself.
Used to be that when I viewed netlix my computer was much slower to retrieve then by 5500. Now all of the sudden my 5500 has slowed way down when retrieving. I can get it to my computer much quicker. Did some firmware update change the way the 5500 is connecting and retrieving from Netflix.