well yeah smartphones aren't designed to run at 100% of the cpu/gpu speed for long periods of time. If they were, they would have to be a lot bigger and/or have active cooling. I guess I never really noticed the "wall" because all the mobile games I play do not push the phone to the limit. When you are comparing it to the past though, remember the newest CPUs are significantly faster clock for clock. 1.5ghz is not the same for an A9 vs Krait 400.