The fastest is to “candy cane” or “rainbow” the load if it is a mixed bird and slug stage, but it is also the most dangerous. One make up shot and your whole sequence can but destroyed.
I have done several candy canes, but it is usually at the beginning or end of a stage to eliminate possible mix ups. I prefer to run all of the slugs in one set even if it means a longer or harder shot on one of them to prevent the possible DQ or target destruction.
I also agree with the thought that if you are not sure of your sequence, then burn it into a safe area and reset the load.