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I'm teaching a course using Processing.py and two of my students are having chronic problems with Processing. It seems to consume a lot of CPU and drains their battery quickly. Performance also degrades, with longer and longer times needed to start up sketches until they restart their machines.
When we look in Activity Monitor there are various processes called "Processing" in there, even when no sketches are running. Is it possible that Processing is spawning processes that aren't getting killed when the sketches are closed?
One student is on Sierra, the other on Yosemite.