Terry,
ES% - Early Speed % is a percentage expression of the Early Speed Points calculated by the NewPace method (the points themselves are not shown). If you sum all the horses ES points, then take each horse's points and divide it into the total, you get the % of the Total which belongs to each horse: it always sums to 100%.
That's what is shown in the NP column labeled ES%. We treat these percentages as a new form of 'points'. We accumulate them to find where we cut off the definition of 'early' horse; we identify the 'gap' of the top horse (or horses) over the others, etc. All this according to the NewPace concepts, which - if they sometimes clash with RDSS readouts, or with a common sense Matchup - are at least self-coherent, and automated.
As Doug mentions, Dave Schwartz covers the calculations in great detail in his videos. You should have watched these at least once - then forget them and let the software do the calculations for you
Ted