The native off was only to speed up response of the client. It does vary from TV to TV wether turning it on or off will cause lag or not. I find that usually it does speed up their response turning it off simply because the TV doesn't have to change its settings. As for the barrels in wall...

There's a few places settings need to be changed to get beat PQ. First go to menu, settings, video, resolutions, and make sure all boxes your TV supports are checked. Genie boxes automatically pick the best resolution possible as lone as all are checked. Next, while on normal picture (is live...