Large parts might contain thousands of GCDs in a single category (such as Curved Walls or Curved Surfaces). To avoid performance issues when working with this many GCDs, aPriori automatically highlights and selects GCDs only when the GCD Category node has fewer than 2000 GCDs. GCDs will not be highlighted if more than this number is selected. Note that your aPriori System Administrator can modify this setting with the gcds.to.highlight.threshold property in the apriori.properties or apriori.user.properties file. See the System Administration Guide for more details.