Go to this thread and follow the instructions to install this camera app: http://forum.xda-developers.com/show....php?t=2752440
Works so well. The shutter speed is almost instant and the framerate is a little better than every other app I've tried. Your experience may vary but this was like a godsend for me since I love AOSP so much and don't want to go back to stock just for the camera. The only issue I still have is that the overall photo quality isn't that good, but I guess that's a problem I'll face for as long as I'm using an AOSP ROM.
I don't know if the app works so well because it's made for a 13MP camera or what, but it's awesome.