I have an early 2006 Mac-Mini upgraded to 2.0 GHz Core 2 Duo, 2GB ram and 500 GB hard disk running Snow Leopard. This computer is fast enough for most of my applications. However I have noticed that when I watch videos from CNN or BBC the speaker's lip movement does not synchronize with the spoken words. The video plays perfectly in my other computer (a mid 2010 Macbook) and even on my mobile phone. Kindly let me know if I need to further upgrade my Mac-Mini and if so then what component should I upgrade.