Using mix in Albedo channel cause huge 10-15 seconds ( depends of scene complexity ) lag, freeze of whole C4D while editing nodes. Other channels like specular, metallic works fine with mix. Tested in Universal and Standard Material
Image Adjust node, brightness adjustment - these sliders value ranges are totally out of way. Most of them should have values from -1 to 1. There is no way to adjust using sliders. I reported this many times...