Looking at the date it was posted (that video) that s3 must have been running old 4.1 firmware.
performance has increased by ~30% in GPU benchmarks and
maybe even more in real gaming from 4.2 onwards (which have the latest Mali drivers).
I am done with gaming right now but from my experience ,with latest Mali drivers asphalt 8 was smooth(Maxed out) except for one stage which was I think was the Tokyo race where fps averaged about 20fps (S2 lagged in that stage too).
And rip tide GP2 was smooth throughout with no lag and fps averaged around 52 (used fps meter from play store )
Gaming was a pain before 4.2 ,but right now it isn't for the most part(CPU throttling down to 800mhz )
No other game in my memory lagged usually I keep CPU at 1300mhz and with some undervolting (to decrease throttling )
and GPU at 350mhz (that's right Riptide GP2 was smooth at the frequency) but for asphalt 8 440-533mhz and maybe 700mhz when I come across a game which really lags.(Again 700mhz is stable ,no crashes or instability only battery drains pretty fast.)
Actually fillrate has been the strong part for Mali 400 gpu.