# Is it possible to force 'mouse acceleration' behavour off in all PC games? **URL:** \ **Category:** The Game Room\ **Created:** [October 23, 2010, 4:42pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107 "2010-10-23T16:42:35Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Lobsang](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/lobsang/32/4067_2.png) [@Lobsang](https://boards.straightdope.com/u/Lobsang)\ **Post date:** [October 23, 2010, 4:42pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/1 "2010-10-23T16:42:35Z")
I see it a lot these days. In my newest game Fallout New Vegas it only occurs in the menus and pip-boy, thank og. It’s where normal movement of the mouse causes the cursor to move at a glacial pace, then a very tiny increase in physical movement speed causes the cursor to fly across the screen at four hundred billion miles per hour. This may or may not be a symptom of the games being made on consoles and ported to PCs, or made for gamepads and not _properly_ adapted for mouse movement. I accept that the couldn’t-care-less-about-the-small-market-of-pc-gamers game producers probably won’t stop doing this any time soon. So… Is there a way of ‘hacking’ or bodging the OS or game itself to cause the mouse movement to behave normally? ---
**Author:** ![Palooka](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/palooka/32/2902_2.png) [@Palooka](https://boards.straightdope.com/u/Palooka)\ **Post date:** [October 23, 2010, 5:16pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/2 "2010-10-23T17:16:14Z")
No. Sometimes it’s hard-coded into the game engine, as is the case for Fallout 3/NV and the Gamembryo engine. ---
**Author:** ![MJinks](https://avatars.discourse-cdn.com/v4/letter/m/da6949/32.png) [@MJinks](https://boards.straightdope.com/u/MJinks)\ **Post date:** [October 23, 2010, 6:33pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/3 "2010-10-23T18:33:06Z")
In case you weren’t aware, you can change some settings in a couple of \*.ini files to get rid of it in Fallout:NV. I know you did ask but I’d hate someone to have to needlessly suffer the terrible mouse acceleration in that game. ---
**Author:** ![Lobsang](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/lobsang/32/4067_2.png) [@Lobsang](https://boards.straightdope.com/u/Lobsang)\ **Post date:** [October 23, 2010, 6:56pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/4 "2010-10-23T18:56:50Z")
Happen to know which setting to change? As I say, it is _only_ a problem in menus and the pip-boy. Outside of those there is no problem (except for the sporadic pausing and fps-slowdown, which I’m sure they’ll patch soon) But I’d still like to eliminate it if it’s possible 🙂 It is annoying not being able to use the pip boy as ‘efficiently’ as I can use a typical windows app with the mouse. ---
**Author:** ![MJinks](https://avatars.discourse-cdn.com/v4/letter/m/da6949/32.png) [@MJinks](https://boards.straightdope.com/u/MJinks)\ **Post date:** [October 23, 2010, 7:17pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/5 "2010-10-23T19:17:18Z")
Open **Fallout\_default.ini** in _C:\Program Files (x86)\Steam\steamapps\common\fallout new vegas_ Scroll down to [CONTROLS] and add the following: fForegroundMouseAccelBase=0 fForegroundMouseAccelTop=0 fForegroundMouseBase=0 fForegroundMouseMult=0 Do the same thing to **Fallout.ini** and **FalloutPrefs.ini** in _C:\Users\*_\*\*_\Documents\My Games\FalloutNV_. That should do it. Those locations are probably different if you don’t use Win7 64bit but hopefully you can find them. Good hunting. ---
**Author:** ![Lobsang](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/lobsang/32/4067_2.png) [@Lobsang](https://boards.straightdope.com/u/Lobsang)\ **Post date:** [October 23, 2010, 7:25pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/6 "2010-10-23T19:25:46Z")
Will give that a try when I get home tonight. Thanks 🙂 ---
**Author:** ![SenorBeef](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/senorbeef/32/2220_2.png) [@SenorBeef](https://boards.straightdope.com/u/SenorBeef)\ **Post date:** [October 23, 2010, 10:21pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/7 "2010-10-23T22:21:23Z")
I don’t know why the hell they even give the option for mouse acceleration. What sort of backwards ass ape-man would want it that way? ---
**Author:** ![Lobsang](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/lobsang/32/4067_2.png) [@Lobsang](https://boards.straightdope.com/u/Lobsang)\ **Post date:** [October 23, 2010, 11:47pm UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/8 "2010-10-23T23:47:17Z")
> [@MJinks](#): > > Open **Fallout\_default.ini** in _C:\Program Files (x86)\Steam\steamapps\common\fallout new vegas_ > > Scroll down to [CONTROLS] and add the following: > fForegroundMouseAccelBase=0 > fForegroundMouseAccelTop=0 > fForegroundMouseBase=0 > fForegroundMouseMult=0 > > Do the same thing to **Fallout.ini** and **FalloutPrefs.ini** in _C:\Users\*_\*\*_\Documents\My Games\FalloutNV_. > > That should do it. Those locations are probably different if you don’t use Win7 64bit but hopefully you can find them. > > Good hunting. It works. Thanks! Now I have to un-get-used to the acceleration and get used to it working properly 😃 Now if only the devs would fix the damn npc slowdown issue (seems to only affect the game on windows 7 65 bit according to forums) ---
**Author:** ![BigT](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bigt/32/12044_2.png) [@BigT](https://boards.straightdope.com/u/BigT)\ **Post date:** [October 24, 2010, 3:58am UTC](https://boards.straightdope.com/t/is-it-possible-to-force-mouse-acceleration-behavour-off-in-all-pc-games/558107/9 "2010-10-24T03:58:44Z")
> [@SenorBeef](#): > > I don’t know why the hell they even give the option for mouse acceleration. What sort of backwards ass ape-man would want it that way? I could understand it if you were already used to mouse acceleration in your OS, but then why not use the exact settings from the OS?