[Pharo-project] Save and quit vs. Save - a clue to performance???

Hello all, I've noticed something that seems unusual to me. Choose save and quit, and the writing cursor appears, disappears, and the image is almost immediately gone after that happens. Choose save, and the cursor appears, sticks around for about the same amount of time as for save and quit (this part is a little bit of a stretch), and then the image becomes unresponsive for (depending) one or more seconds. Anything? When combined with comments people have made about the event loop, I wonder whether the system idles when it should not, or something like that??? Sorry if this is a wild goose chase. Bill