I'm just going off of what a few people said on the Amazon reviews.. This one in particular.
"1. Video Lag. When you pass your HDMI cable through the receiver into your TV, the receiver likes to "take over" the signal by imprinting things like their on-screen settings and volume control. This is actually an awesome feature for most users because you can see all of the receiver controls right on your screen. Unfortunately, the cost for this feature is additional video processing that happens within the receiver, meaning, there's a slight lag introduced in your video signal. I ran some tests and the delay is about 50 milliseconds when the on-screen controls are enabled. To combat this issue, Marantz has an "audio sync" feature which delays the audio to sync with the delayed video signal. So, for most users the video lag introduced by the on-screen settings will not be an issue. If, however, you want to play twitch-reflex video games (e.g., Rock Band, Call of Duty, etc.), your gaming performance will suffer as a result of this lag. In Rock Band, for example, there is a very noticeable delay between singing into the mic and then hearing the actual sound through your speakers. Marantz does allow you to disable the on-screen controls so that you can directly pass the video signal through (thus, eliminating the delay); however, you lose the cool on-screen controls and are required to use Marantz' tiny LCD to read the volume and input values."
