I don't know what to blame. My system consists of Optoma HD33 hookuped to Denon 1612 being run by GTX580-based computer.
No lag on LCD monitor.
It's when I hook the computer up to my PJ, the lag shows up and it's atrocious. At least half a second. I will move my mouse across the screen and stop before the pointer starts moving. That bad. FPS games are unplayable because there's no connection between my inputs and what's going on on the screen.