return data is put into the queue. Refs #18583

main.py

@@ -587,6 +587,9 @@ def threaded_image_builder(data, reference_profile, dataQueue, settings = dict()
     return_data['kivy_image'] = kivy.core.image.Image(image_bytes, ext = 'png')
     Logger.debug('threaded_image_builder: Took ' + str(time.time() - start) + ' seconds to manipulate image data')
     dataQueue.put_nowait(return_data)
+    # Destroy the created figure to prevent hogging memory.
+    # @see https://redmine.koumbit.net/issues/18583
+    figure.clear()
 
 
 def init_plot(settings = dict()):