I don’t know if you were able to figure out some things but I have been looking into it myself and the information out there is so little. I have found that flushing tests do help and adjusting your flushing with the water tap icon to help the speed in that case but not only that will help you save on wasted filament. I even looked at the K2 and found that when it did the color change it wiped the nozzle off with the silicone on the hopper. I am trying to figure that out and see if that would help speed things up. For me looking at the Bambu Lab color 3d printer AMS did give me some insight, but I am still looking. I have a print that would normally take me 45 minutes with a single color. But it is taking two days to get it done. I know the flowrate is faster within the machine. So I know it should be faster. I’ll keep looking, but I have been looking into all kinds of color 3d printers to see how to do this and it isn’t helping much…but sadly, it is helping.