This has been around since ..well forever ....This is an excerpt from a very good Guide.....just replace fallout 3 with Skyrim as you read.....lol and when you see Oblivion replace that with Morrowind...LMAO
http://www.tweakguides.com/Fallout3_3.html middle of page...
Lag/Freezes/Stuttering: Many people are complaining about stuttering in Fallout 3 and the momentary freezes and performance drops that come with it. Since Fallout 3 is based on the same engine as Oblivion, the causes of this stuttering and the solutions are pretty much the same: the Fallout 3 game world is extremely large, open, and relatively detailed. There are a lot of different objects, textures and sounds which need to be loaded up as you wander around the game world, and these have to be constantly loaded up from your hard drive into your system RAM and video RAM and back again onto the drive as required. This means that for systems with slower hard drives and/or less system RAM and/or less Video RAM, there will be noticeable periods of stutter and inconsistent FPS as you wander around, even moments when the game will appear to freeze for a bit. This is not a bug as such, this is the way the game engine is designed to handle the loading of data in a large open game world; it simply can't preload every piece of information about the game world at the start of the game as there's too much data to preload, so it loads the data piece by piece as necessary - you will often see your drive light on when these stutters/pauses occur, confirming that it is related to data loading.
Aside from defragmenting and general system optimization (see below), reducing your settings is one way of reducing stuttering - see the In-Game Settings and Advanced Tweaking sections for specific settings which affect stuttering. In some cases however, only a hardware upgrade will reduce this type of stuttering. If you're considering a hardware upgrade, I would strongly recommend getting a fast hard drive such as a Western Digital Raptor or a Solid State Drive (SSD). Combine that with at least 2GB of RAM, preferably 4GB or more, and a graphics card with 512MB or more of Video RAM, and this will provide the best method of virtually eliminating data loading stuttering in any game, not just Fallout 3.
Note: There is another type of stuttering which can occur, often referred to as micro-stuttering, juddering or skipping. It usually appears as tiny skips, like missing frames in a movie. This is not the same as the normal type of stuttering mentioned above, it is not caused by loading new data, it appears to be an actual bug related to graphics synchronization in the Gamebryo engine, possibly made more noticeable by certain graphics drivers. A video demonstration of the problem is shown here. To confirm the problem, use the iFPSClamp=60 setting as covered in the Advanced Tweaking section - if that removes the skipping then you are experiencing this issue. However changing iFPSClamp does not properly resolve this problem as it will then ruin your overall game speed at certain times. At the moment the only known solutions you can try are to firstly force enable VSync both in the game as well as in your graphics card's control panel - see the VSync option in the In-Game Settings section for instructions. If changing VSync doesn't work, try using a different version of your graphics driver. If that still doesn't work, there is a fix which some users claim works in removing this type of stutter: The Fallout 3 Stutter Remover mod (and this mod for Fallout: New Vegas users). If none of these things work then you will have to wait for either a patch and/or a new graphics driver version to resolve the issue. It's an issue that's been present in the Gamebryo engine at least since Oblivion so it is not new, and so far there is no real solution.
The "iFPSclamp=0" is still available so you can verify if this is your stutter. (I have it in my Generated INI)
In Oblivion this was fixed by OSR "Oblivon Stutter Remover" really hope they make one for Skyrim. IN OSR we had this setting in the INI ...bFix64Hertz = 1 it always fixed it.
The creator of OSR did post in the General section of Skyrim and had this to Say ...http://www.gamesas.com/index.php?/topic/1159912-to-the-devs-fix-the-64-hz60-hz-bug-for-skyrim/page__view__findpost__p__18687406