Do not cover the whole screen with 1 Zone. The larger the capturezones are, the slower the calculation (delay) is. And it took a long time to compute each pixel in a high resolution ;-) . The smaller the zones, the better.
The sense of ambilight is not to copy your screencolor to your room, but to let the colors flow out of your screen. So it makes more sense to only use the colors at the screen margins
For example you use one Strip and 2 Bulbs, do it like this (Bulbs Left and Right; Strip Bottom or Top):
Of course if you have another aspect ratio like in fullscreen games, you have to reorder your zones to the new screen margins.