Using latest version of Mac Rhino 6 (6.17, 2019-08-24), in a new file (completely empty) with a very simple grasshopper script running, I get a “System out of Memory” message from OSX that shows Rhino using 25GB+ after about 10 mins. Possibly related to the dot display component? There are about 30k points from an external source internalized into “block-centers” as shown in the screenshot.
Can you please attach the definition? It would help not having to do any guess-work to reproduce this.