KF2 Quick Mouse Acceleration Fix - Three INI Lines

Killing Floor 2 can feel floaty on a mouse out of the box. The short Steam guide behind this page boils the fix down to three INI settings and one video option. It takes about two minutes and needs only a text editor.

Step 1: Unlock the framerate

In the in-game video settings, enable Variable Framerate. This removes the 62 fps cap, and a higher, uncapped framerate is the first thing that makes the mouse feel less laggy. If you want a deeper look at the cap itself, see removing the 62 fps lock.

Step 2: Turn off mouse smoothing

Close the game first, then open this file in your Steam library folder:

Steam Library\steamapps\common\killingfloor2\Engine\Config\BaseInput.ini

Set:

bEnableMouseSmoothing=false

Step 3: Turn off view acceleration

Next open:

Steam Library\steamapps\common\killingfloor2\KFGame\Config\DefaultInput.ini

Set both lines:

bViewAccelerationEnabled=False
bDebugViewAcceleration=FALSE

Optional: scoped sensitivity

The author also prefers a slightly lower sensitivity while aiming down sights:

ZoomedSensitivityScalar=0.70

Adjust the value to taste; lower numbers make zoomed aiming slower and steadier.

Tips

• Edit the files only while the game is closed, and keep a backup copy of each file before changing it.
• A game update or a "Verify integrity of game files" run can restore the defaults, so re-check these lines after big patches.
• For a different approach that edits the user config instead of the install files, see mouse settings fix in KFInput.ini.