Try this http://skyrim.nexusmods.com/mods/34 and set the game to various rates between 30 and 58 until you think it's smooth. You don't want to go any faster than what looks smooth to you so the inevitable drops are not as noticeable. Most think 37 is good for this game. You don't want to go over 56 to 58 as things can start to get weird.
I think you need SKSE (Skyrim Script Extender) to use this. There is a link to that in the readme.