Just got Fios Installed 2 weeks ago, I have 1 Whole House DVR box and 2 regular HD Digital boxes (Cisco C335HDC). I notice that sometimes when hitting the guide or even just browing through the guide it is very slow.
Oddly enough I was at my friends house the other day and he has FIOS (using some big silver box) and it was much faster and smoother switching channels/browsing the guide then me.
Any ideas?