The way you did it was right mate, which means your stutter might be caused by something else.
Have you tried deleting your Skyrim.ini and SkyrimPrefs.ini?
Also are you testing with a save that was saved in 1.4 patch, or a save from a previous game version?
Have you tried deleting your Skyrim.ini and SkyrimPrefs.ini? :yes i reinstalled the whole game for the new patch with fresh INI and SkyrimPrefs.ini
Also are you testing with a save that was saved in 1.4 patch, or a save from a previous game version?:my save is from previous version ,i will try a new game and post my results but i doubt that this is the problem .
update :like i thought, starting new game didn't solve stuttering