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uGrids
The worlds in Bethesda’s role-playing games are split into hundreds of thousands of sections (uGrids). By default, Skyrim loads the five nearest sections within your line of sight, plus the one your character inhabits. Beyond those five sections the entire world is rendered using low-detail trees, objects, and terrain, which, for the most part, cannot be modified or enhanced by .ini tweaks.
On a mid-to-high end system this setting can be tweaked, forcing the game to load seven sections, dramatically improving scene quality in many locations. Higher values, such as nine and eleven, are extremely unstable and therefore only recommended for users wanting to create wallpaper-worthy screenshots.
By rendering this extra detail your frame rate will be reduced (to what extent is impossible to say as this reduction can vary wildly from scene to scene). Furthermore, each section is loaded from the hard drive as a character moves through the world, and so higher uGrid values can cause hard drive thrashing, which may result in massive, temporary performance drops as the game catches up. On our Western Digital Caviar Black, 7200RPM drives this did not occur, but on slower ones it might, so your mileage with this tweak may vary.
One final caveat: altering the uGrid setting will modify your save game. If you ever wish to revert to a lower uGrid setting due to performance issues, the correct procedure must be followed to ensure that you do not make that save inaccessible, or possibly even corrupt, resulting in the complete loss of your character data and game progression. In all our tests we have followed these steps precisely and have never had a problem, but if this thought still scares you silly back up the entire ‘Saves’ folder in My Documents\My Games\Skyrimbefore you begin tweaking.
Now, let’s get to the fun bit: comparing uGridsToLoad=7 against the default value, uGridsToLoad=5.
In the pictured scene we lost three frames per second by enabling uGridsToLoad=7, which is fine by us considering the dramatic improvement in overall fidelity. To implement this tweak open Skyrim.ini in My Documents\My Games\Skyrim. At the very top, in the [General] section, change uExterior Cell Buffer=36 to uExterior Cell Buffer=64. This value should always be (uGridsToLoad + 1)^2. In our case, 7+1x8=64. Broken down, that’s the seven nearest grids to load, plus the one your character inhabits, multiplied by the result.Directly below uExterior Cell Buffer=64, add uGridsToLoad=7 to the file. This number can only be ‘odd,’ and as mentioned earlier values above 7 are incredibly unstable. Save the file and set it to Read Only.