Just bought the new mac mini with HDMI out - 2.66Ghz, 8 Gb RAM, 500 Gb HDD A lot of mkv or avi files I playback appear pretty choppy in VLC - my primary app for watching movies and tv shows. I have a Drobo with two 2 TB SATA drives where I store all my stuff and which is connected to my mini via firewire 800. I've tried playing the same video back from both the Drobo and from the internal hard drive, to see if the choppiness was on account of the external drive or not. No difference really. A choppy video remains choppy from either place. It's pretty strange because some 1080p videos play just fine, with no choppiness whatsoever, while other 720p videos or even standard definition divx files are still choppy. Can anyone advise me on what my options are? Thanks a bunch in advance.