The hardware can only do about 15 fps at the 5 mega pixel capture setting. But using simple averaging in both time and space, a 30 fps low rez viewfinder can be simulated, and it would only be 1/15th of a second behind realtime. You wouldn't notice.

So what?

Well, since fcamera (and the default app) use low rez capture for the viewfinder, the rez has to be changed at capture time. This hardware rez change takes about 7/10ths of a second. Bad. Very bad.