How to fix mouse control problems
Introduction
Dead Space has several isses with mouse controls, like lag, acceleration, deadzone and low sensitivity. The good news is that there are ways to get rid of these and make it work almost as well as Dead Space 2. This guide will tell you how.
Someone has made a fix that allows raw mouse input. I highly recommend that you try it first instead of using the workarounds in this guide. It should work much better.
Link to Fix[community.pcgamingwiki.com]
Vsync
If you really want Vsync on because you get a lot of screen tearing, you can experiment with leaving it off in the game and forcing it on in your video card's control panel. Another option that could help with screen tearing is to force Triple Buffering with the control panel or another external program.
Editing the config file
Next, you will have to find and edit the game's configuration file. This will fix the other problems with the mouse controls: the acceleration, deadzone and low sensitivity.
One downside with this fix is that the mouse cursor will move very fast in the game's menus. This is an unavoidable problem if you want the higher sensitivity in gameplay. However, you can simply use the arrow keys and Enter/Esc to navigate the menus instead, it works just fine.
The first step is to find the config file, named "settings.txt". Make sure that you run the game at least once first so that the file is created by the game. On Windows 10 it is located in your user folder here:
If you cannot find the AppData folder you need to enable showing of hidden files in the Windows Folder options.
Another way to find the AppData folder is to open the run window by pressing the windows key and R (WIN+R), typing "%LocalAppData%" and pressing enter. That should bring up the folder whether it is hidden or not.
If you're using a different Windows version, another OS, or have the game on another store such as Origin, the file might not be in that exact location. In that case it might be easier to search your user folder or C drive for "settings.txt" or "Dead Space". Again, make sure you have run the game once first.
When you find "settings.txt" open it with notepad and copy and paste the following text into the bottom of the file:
Then save the file and play the game. If you're not happy with the mouse sensitivity you can change it by editing the "Control.MouseSensitivity = 2.00000000" line and try a different number, where higher is more sensitive. The in-game mouse sensitivity settings will only allow you to go up to 1.0, which is way too low, at least for my mouse.
Conclusion
This guide was created by its original author on the Steam Community. Are you the author and want it removed? Request removal.