It's not world quests, it's the equipment compare tooltips that pop up next to gear. Check the fps when you hold shift over any piece of gear in a slot you have something equipped. I have also noticed this but wrote it off since some addons hook to compare tooltips. If that video is of the default UI with no addons, then yes, it's a blizzard issue. Something in the OnUpdate scripts for compare tooltips is processing too much.
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