Hey thanks for pointing me to that system settings I didn't know existed (new with Linux). I tried it and while it does slow down my cursor, it doesn't slow it enough, even if I put it to the minimum (you probably now get the point how fast it is). Maybe if I can somehow increase the range of how much it slows down the cursor or something.
Btw, I found this solution, but I don't have xorg.conf file in X11 folder...
To make the config persistent (and make it system wide), you will need to edit your xorg.conf (/etc/X11/xorg.conf).
Identifier "Razer" # Whatever you want.
MatchProduct "Razer Razer DeathAdder" # Product name from xinput list.
Option "ConstantDeceleration" "3" # The same value as xinput.
Once you reboot, you should have the same result as the xinput command.