Skyrim Tips that Help with Mouse Lag and Physics Glitches
The 1.3 fixed the y-axis sensitivity. These modifications still apply for mouse lag/physics glitches:
Many problems are caused by having your fps go above 60, but if you leave vsync on (capping the fps at 60 of 120 depending on your monitor), the mouse lags like crazy. I haven’t been able to get triple buffering working (on my GTX 570), but I have figured out how to fix both problems.
These tweaks go in one of two INI files (Skyrim.ini or SkyrimPrefs.ini) located in Documents/My Games/Skyrim.
Fix mouse lag by disabling vsync in Skyrim.ini
– Add iPresentInterval=0 under the [Display] section
Fix mouse acceleration by disabling it. This goes in SkyrimPrefs.ini
– Set bMouseAcceleration=0 in the [Controls] section
The following change is not recommended with the 1.2-onward patches. If you had previously added this and are experiencing mouse issues, try removing the changes:
Fix y-axis sensivity being different from x-axis in Skyrim.ini
– Add to following under the [Controls] section. If you don’t have a [Controls] section, add it!
PLAY WITH fMouseHeadingYScale UNTIL IT FEELS GOOD IN GAME. For me making them match had the y-axis more sensitive than the x-axis (might be due to 120Hz monitor, 0.0140 was the sweet spot). So play with it until they’re the same. Test this in an area that is closest to your average fps – which is hopefully 60fps (due to sensitivity going lower the lower your fps goes – no fix for that yet).
There are more tips on the Neogaf Forums but things are still in somewhat of a mess as we figure out what works well and what does not. Some tweaks have been shown to have unexpected side effects. Unless you are an advanced user that likes living on the dangerous edge, I would recommend sticking with as clean of an install as possible.
I also recommend protecting your saved games against corruption and loss by using Dropboxifier.
* You can also use something like dxtory to limit your fps (useful if you are already using a modded d3d9.dll). I leave it to your discretion, but can offer no support on other fps limiters since I don’t use them.