I honestly can't find that to be meaningful. It could not be there, and I wouldn't notice a difference. :/
I hope it gets added as a toggle for those who don't like it though.
It gives it a bit of a blurry effect to put in layman's terms. I didn't know what I was looking at but I noticed it in BB as well. I honestly thought it was my TV or something, as I don't remember that effect in the alpha/beta and I've changed TV's since then.
Now that I know what's causing it I feel better that it's not on my end, but I would really like to see it corrected if it's possible.
I also noticed the frame rate issues, but there's no way in hell I would have known what the real problem was- I didn't even know such a thing as frame pacing. This is the first I'm hearing of it.