Is to do a factory reset, then set it up for the carrier is need be. I see this all the time after folk install a lot of apps. At the counter time is precious so we can't pick over the installed apps to clear out one by one. But you can do that or the reset.
Samsung S Duos is working very slow. What should I do to make it working faster?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic