Sounds like your GPU is struggling to handle particle effects, namely smoke on touchdown. Even if there is no visual cue, the script within the aircraft’s parameters is still calling for that routine hence the touchdown stutter. First I’d suggest finding a way to disable said aircraft effect if only to confirm the theory, and/or go into the Nvidia Control Panel tweak some settings there. Always make a note of your NCP settings before making changes so that you may revert back if required.