I have a problem with extreme stuttering in Fallout: New Vegas. It stems from an engine issue existing in Oblivion, Fallout 3, and a Fallout: New Vegas. It results in a stutter every second when the engine drops frames at the end of search second. The issue is prevalent enough that a mod exists for the script extender for each of these games to removes the stutter. This mod runs a script which changes the engine's thread scheduler to ensure that no frames are not rendered more than once per 1/60th of a second resulting in no dropped frames and thus no stutter. Unfortunately the moder is no longer updating the modification and therefore Fallout: New Vegas has been rendered unplayable for me.
Thanks for your support.