Hi,
The spot in the video is not the only location it happens. it is everywhere in the barrens, I have captured more that I can upload.
I took a level 6 character to the barrens and the issue does not exist at all.
I started to remove quests from my quest log on the character in the video, as soon as I got down to 5 quests the issue is almost not there. When switching sub zone the FPS drops by 1 frame and is not noticable, when I switch to a major zone like ashenvale or stonetalen the frames drop by 5 rather than 10 -15.
I collected the quests as per the guide again, and the noticble stuttering was back.