Alright, I've got one more trick up my sleeve... See the end of this post.
Between you and I these RK3188 chips were mainly designed to be powering video to HDMI (video as in video's, movies, tv shows, etc.). The hardware may not good be enough to get 50FPS.
Thanks for the test - I'll keep the updated drivers in the public release as it did some good (resolved the tearing issues).
I'm uploading a .002 version - hopefully that will do the trick or at least provide you a somewhat better performance gain.