vpython app stopping takes a few minutes

from vpython import *
b = box()

Run python script.py on cmd / Powershell on Windows. New tab appears in browser.
Close the browser tab
Try to terminate the application with Ctrl-C, Ctrl-D, .. Nothing seems to happen. After few minutes (1? 5? 10?) the script returns to the console.

Thanks for the report. I note that there is a workaround, which is that if you kill the browser, not just the tab, there is a clean exit.

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