I have a new 15" MacBook Pro with the highest specifications, running Lion version 10.7.2. However, when I watch movies they sometimes lag on my computer: frozen screen (for 3-4 s) with lots of broken cubes and with the audio track still playing). What could be possibly wrong with my computer?
For example, today I watched the Fast Five Blu-ray movie (which is almost 50 GB) with the VLC media player and suddenly it started lagging on some episodes (especially on intense action ones with lots of special effects). Moreover, it lags not only on Blu-ray movies but movie files ripped from standard definition DVDs and other formats as well.
I play all those movies with the power plugged in from downloaded files, not from optical DVDs. Even Stanford University lectures from iTunesU sometimes lag for me.
UPDATE: I was in the Genius bar several times, reinstalled Lion by my own and also in the Apple Store.
After the fresh install I tried to test videos. I watched House, M.D. season 8 episode 2 (395.9 MB) yesterday, and it started lagging all over again. I do not really know what to do. Is this a bug in VLC, iTunes, and other media players, or it is something wrong with my hardware (they actually tested my Mac in the Genius bar with their cable plugged in but did not find any problems)?