A question regarding internal resolution.

[F00rk]

Seems like i'm having resoliution problems too, but my problem is that it affects... too much.
In the game that I'm currently playing Disgaea - afternoon of darkness switching from 1x to 2x resoliution costs way too much on dynamic scenes(Speed drops to 20-30% during skills) but 1x perfect 100% (with frameskip of course)
I tried turning multithread on but not much speed gain (10%) for the cost of flickering, so that's probably my gpu fault
So device is Rk3066 based tablet so is mali 400mp4 gpu realy that underpowered?