the game already has so many issues, including garbage acceleration.
here's what you paste into the document:
[/Script/Engine.InputSettings]
bEnableMouseSmoothing=False
if you need a detailed step by step, here it is:
go to your pc search bar, type %localappdata% and hit enter
look for M1
open Saved folder
open Config folder
open Windows folder
create a text document, and paste
[/Script/Engine.InputSettings]
bEnableMouseSmoothing=False
in that document
go to File in top right, click save as
change the "Save as type:" to All files
name the document "input.ini"
obviously you'd have to restart your game for this to work afterwards