I would start by eliminating some of the possible slowdown areas. Are you using wireless? If yes, try connecting with a cable to your modem or router. Did this just start or has there always been lag?
If you have a laptop does it do the same at other locations?
tried the update, no change. I have also noticed when scrolling it sticks for a second or two, again only on the fb page. this site causes no grief with scrolling. i installed fb from the store and have no problems with that. got me beat