The TFT work just fine as such but its all just to slow. Probably with perfectly optimized drivers or such it would be faster but fast enough? I don't know. And I have not a single clue how to do that and is not something I expect anyone would do either since there are faster displays out there anyway.
If in a menu and you want to go back to the main page the screen will be erased with a fillScreen, then make a white background and the stuff that should be there. That would have take around 1.2 seconds which doesn't look really nice or pro at all.
Parallell display it is.