Turn off any remaining "magic" or "auto-color" or anything else that sounds like a patented, gimmicky name. Generally any color or picture settings that imply an "auto" mode are just processes. Settings that say "custom" or "manual" are the ones you want to gravitate towards. If your picture/color looks worse on these manual/custom modes, then feel free to move the manual sliders around (Sharpness, RGB color balance, and contrast sliders, etc. are all fine to customize and won't affect lag). My Samsung has a common "Magic Color" setting that is supposed to auto balance colors dynamically. This option is not turned off by PC mode, so turning things like this off is necessary to "purify" your signal and eliminate remaining lag. I also have a "Magic Bright" picture mode that adjusts other picture aspects on the fly. Turn anything like that off as well. Make sure you go through each subsection of your settings (eg. Picture, Color, Input, General, etc.), and when in doubt, just google something if you don't know what it is. If you turn something off and it makes everything look like garbage, then obviously you can keep those vital processes. Once again remember if you do mess anything, you can just reset and try again.