Incredibly Slow Swing Speeds?

[Jedibrad]

Lately, I've been having a rather peculiar bug - my weapons become incredibly slow. After a bit of searching, I found other people have had problems like it, but it was always constrained to one hand; my problem includes both. I made a quick video demonstrating it:

http://youtu.be/FXRSP-wPhz4

It happens randomly, and sometimes seems to be fixed by fast travelling. I have no mods installed that effect weapons speeds (at least not that I know of), so I don't think there is a confliction there. I believe it might be caused by swapping weapons (e.g. going from my bow to my swords), but that might just be a coincidence. Has anyone else experienced this? Or, even if not, does anyone know of a way to fix it? Thanks!