It's a bug with the new experimental and disabled "Speed" NBT tag (Change the mob speed for adventure maps makers)
This will be fixed in the next snapshot.
They should probably make sprinting slightly slower though, it's way too fast; you can easily outrun zombies, creepers etc.
While we're at it, let's nerf pickaxes as well so that it takes twice as long to mine materials and there's a 33.3% chance that you get the block you mined; it's way to easy to get blocks like cobblestone.
Oh right thank you
Hey everyone, I'm back!
They are going to release a 13w21b in the near future that fixes both the sprint and the sound issues.
Shows how much this community reads....
Hey, read the post right above yours, it will answer all your questions!
Unless I'm doing it wrong, pig riding is already fairly useless. :u
Srsly. I'd rather sprint than try to get a pig to even move let alone go in the direction I want it to go in.