iPad 3 is at 1 fps while even iPad 2 is running above 10fps

Testing our application on all possible devices, we discovered that both our iPad 3 (fully updated to the latest iOS) are crawling at turtle speed of 1 fps.

The application is running in debug mode at 35fps on iPhone 5s, over 25 fps on iPad Air, over 10fps on iPad Mini and iPad 2.

I noticed that iPad 3 moved to x2 resolution and so tried to play with the Target resolution, but this did not seem to have much affect on the performance (well - I got to 1.5 fps in debug mode). Also noticed that for the iPad3 (in the Unity generated code on the XCode) the 'Best Performance' does not really come to effect?

Added data: the drop in performance is due to 'AAResolve' which happens within the camera. This started specifically after adding the NGUI which by itself is great, but might be the cause here, hence the need for a solution that might bypass it / explain it.

Any help on this would be great.