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Maybe you should consider upgrading your mac Mini to a later ~2010 model then! Performance is no issue on these machines because Plex' GPU hardware decoding implementation of the 320m is really, really good. You can play back a full bitrate 1080p Bluray rip with < 10% CPU usage and get plenty of headroom for other stuff in the background (multiple other PMS transcoding sessions, unpacking, etc). Add a small SSD and that HTPC/Homeserver-machine should last until 4k gains traction. The rPi is just too slow for high quality playback. OpenELEC comes pretty close and out-of-the-box HDMI-CEC is amazing, but the bad performance ultimately ruins the whole user experience for me.