Strange (possibly normal?) Lantern Issue

[TheBlindHouse]

Here's a video: http://www.youtube.com/watch?v=UyvRzWEMX...e=youtu.be

I lowered all the game's quality settings and tried to get good enough video quality to be able to see the issue. I recorded in 60fps and slowed it down to half the speed so you can get a better idea of how it looks. I find it harder to notice at normal speed via a video and Youtube (*edit* from my experience) caps the fps to 30 anyways. It's much easier to see when slowed down.

Notice that everything else (other than my twitchy hand moving the mouse) is pretty much smooth.