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A projector with DisplayPort connection and input lag is not acceptable since Epson obviously planned this projector to be used with non-video sources. Then it got me thinking.... are all options for video available on the DisplayPort? I thinking perhaps some of the processing that slows input lag may not be an issue on DisplayPort. It would have been nice if you could test input lag separately on DisplayPort from HDMI to see if there is a difference. I would not have asked this question if there wasn't a DisplayPort present. It might be possible to circumvent the lag by using the DisplayPort for those who are concerned about input lag.