The reason for the decreasing efficiency in this step is largely a result of different processing times for different rasters. The four 3m "snowoff" rasters require resampling six times (to resolutions of 10, 30, 50, 100, 300, and 500m), while all other rasters require resampling only three times (the 3m rasters to 10, 30, and 50m; and the 50m rasters to 100, 300, and 500m). Thus, the processing tasks assigned to these four rasters take the longest to process and we see close to ideal efficiency moving from one to four processors. Additionally, there are 39 other 3m rasters that get distributed as evenly as possible over the processors used. The decreased efficiency is a result of the processors with the most 3m rasters to process still requiring a long timeframe to finish their tasks.