Pixelation and skipping during Blu Ray playback in VLC

[Iman07]

Okay well when i tried to play a blu ray on my macbook pro i noticed pixelation, freezing, skipping while watching the movie. I thought my system wasnt powerful enough. So I built a new hackintosh recently (see sign for info) and I think its a pretty powerful system but I still get this choppiness, pixelation and freezing. The movie I am playing is .MKV file and it is a 15gb file tho, this happens with a 9gb rips too. These are 1080p rips. I connected my computer to my 42" LCD, full HD TV and it still happens. I connect my computer to the tv via a a DVI to HDMI cable. whats going on. I mean I HAVE A QUAD CORE AND 8GB RAM!!! and i cant handle a big file? thats BS. what can I do?