I have posted an updated tutorial here ~> to my tutorial..
> Open Insurgency's properties by right-clicking on its library listing in Steam and then clicking "Properties"
> Click on "SET LAUNCH OPTIONS..."
*I cannot supply screenshots for the remainder of the steps because I use Linux*
> Create/Open a new text file with notepad (or some other text editor)
> Copy(ctrl+c) & paste(ctrl+v):
> Save as
"autoexec.cfg" (change to "All files" instead of ".txt document")
into this directory ".../steam/steamapps/common/insurgency2/insurgency/cfg/"
> Launch Insurgency & witness a boost in your frames per second at the cost of lowering hardly noticeable options
If you had trouble, try using Impromtu's Steam guide!
Edited by David your friend, 12 July 2016 - 12:38 AM.