200Mbs homeplugs aren't enough for 1080p mkv content but can handle 720p most of the time (Well mine could at least). My network speed over the home plugs was around 4.8MB/s, over the weekend I just hardwired the flat and now have a gigabit network and I now get around 85MB/s, streaming 1080p files to the PS3 is now no longer an issue. On the fast forward/rewind front, avi no issue, 720p is ok upto 30x speed and 1080p is poor or not do able at 10x speed & over. However you can just jump to anytime point you like using PS3 Media server and that works fine for all file types.