*facepalm*
Okay, not to be demeaning but your grasp of terms is a little weak. Let me be clear.
The One M8 has about two megapixels on its screen. The G3 is *rumored* to have about 3.7 megapixels, or 75-80% more dots that need to be updated every time the picture changes. In practical terms, this actually should reduce performance by about 10-30%, not cut you frame rate in half.
IF the G3 has a Snapdragon 805, its CPU (processor) and GPU (graphics) should be fast enough to run a 3.7 mpix screen AT LEAST as smoothly as the G2 or G Pro 2 ran their 2 mpix screens on a Snapdragon 800. If it has an 800, 801 or the experimental Odin chip I believe the G3 would be slower feeling than most current superphones.
Hoping we get a clear answer very soon.