Why did you make this?

I just thought that it might be funny to make something like this. It could be a good challenge for someone to try and beat minecraft with.

Is it laggy?

So far on the computer I tested, it's not bad at all. I get a mostly decent framerate with it, and it shouldn't lag your's too bad either. In fact, while testing it, I noticed I actually got MORE frames per second when it was enabled.

How strong is the blur?

There are 8 different levels of blur:
3 = Subtle
5 = A little Blurry
7 = Blurry
10 = Blurrier
14 = Blurriest
30 = Way Too Blurry
50 = Sir, This is a Wendy's
100 = WHY

"Sir, This is a Wendy's" is the one used in the image.

What type of blur is it?

Gaussian blur