Problem when streaming 1080p topic

Hi
I have a problem using the app Vu+.
When i'm seeing a channel in 576p there is no problem but when i try to see one in 1080p the vídeo is all slow and the sound fails a lot.
Impossible to enjoy.
Is any rom that i can try or a kernel to fix this, or even a setting that i should change?
Do any one advise me to try with a gingerbread rom?
Thanks