It seems that the device is "locked in" at 30 frames per second both in 2D (Canvas) and 3D (openGL) modes, while anecdotally, a phone like the Hero hits 54fps on average and has "smoother scrolling" in the menus. - Engadget
It is the same thing. 30fps will show motion blur to the human eye, NOT LAG.
The smoothness of the scroll has to do with lag. Lag has nothing to do with fps. They are two different subjects.
Lag is about dropping frames, about rendering the object.
This would cause flickering and motion would seem to pause, which is lag.
It is not because the device is capped at 30 fps, which is enough for the human eye, it is because in those 30 frames per second some are not getting rendered.
If you had a game with that was set to 60 fps, and down graded it to 30fps. Every other frame would not be displayed. Which means it would appear to blur.
What you are trying to do is confuse lag with blur.
Motion blur is when you have 30 frames per second, displaying only 20 frames, and a black, grey, or whit frame replaces it. Lag is when the frame NOT rendered and the last screen is displayed until the next rendered screen comes.
fps can not create lag, it can create blur. If you do not hand the frame to the video card is the only way you can create lag.
Now to make it simple with 5 fps.
Blur at 5fps over one sec with 10 frames
1st image, 2nd drop image, 3rd image, 4th drop image, 5th image, 6th drop image, 7th image, 8th drop image, 9th image, 10th drop image.
This would create a blur effect.
Now to make lag at 10fps
1st image, 2nd does not display, 3rd does not display, 4th image, 5th image, 6th does not display, 7 does not display, 8 does not display, 9 image, 10 image.
In this case the screen just jumps from 1st image to 3rd image then from 5th image to 9 image. This is lag. It has nothing to do with how fps.
Bottom line. Lag is when there is not enough frames are rendered to fill the fps.
Blur is when to many frames are reduced to where the human eye can see them.
Realistic blur is at 24fps.
If the phone is not smooth, which mine is. Then it is a rendering problem, not a displaying problem. If the images are too blurry then it is a display problem not a rendering problem.
But you are still wrong, 30fps in a video game is the same as on your phone. They are both processed and displayed the same.