This mod slightly alters the Fallout_Default.ini file by adding a few lines of code. This removes the Mouse acceleration and improves the games performance. With this fix you have less stutters and a reasonable mouse speed.

RECOMMENDED MODS
4GBNV
http://www.nexusmods.com/newvegas/mods/35262/?
New Vegas Stutter Remover
http://www.nexusmods.com/newvegas/mods/34832/?
Better Game Performance V5
http://www.nexusmods.com/newvegas/mods/51871/?

INSTALLATION
Add this code under [Controls] so that it is the last lines of text under it

fForegroundMouseAccelBase=0
fForegroundMouseAccelTop=0
fForegroundMouseBase=0
fForegroundMouseMult=0

Example of text without added script

[Controls]
bAlwaysRunByDefault=1
bBackground Mouse=0
bBackground Keyboard=1

With the added script

[Controls]
bAlwaysRunByDefault=1
bBackground Mouse=0
bBackground Keyboard=1
fForegroundMouseAccelBase=0
fForegroundMouseAccelTop=0
fForegroundMouseBase=0
fForegroundMouseMult=0

UNINSTALL
Go into the Fallout_Default.ini file that you placed, click Edit, Find, {Controls]
The last four lines of text in controls should look like this
fForegroundMouseAccelBase=0
fForegroundMouseAccelTop=0
fForegroundMouseBase=0
fForegroundMouseMult=0
Delete those lines, save. You're back to the vanilla code