Now if I'm correct, this would be incredibly difficult to optimize for lower powered devices such as a smartphone. Most people don't understand just how deep into color data that this tool goes. The other color adjustments manipulate entire pixels, (the r,g, and b) at once in accordance to the desired result. The RGB Calibration tool splits pixels and only adjusts ⅓ of the pixel (the r,g, or b) individually. Talk about minute detail, I'd say it doesn't get any more miniscule than dividing a pixel! Maybe my assumptions are wrong, but it seems like that's how it would work based upon what it does and how it is labeled. Now that I've shared my unsolicited ever powerful knowledge, lol, my request is that you find a way to optimize RGB Color Channels Calibration for Lightroom Mobile for smartphone, or in my case, premium chromebook.