Mystery lag in completing Django POST request after form.save() completes
One of the forms in my Django application takes a long time to submit, save, and redirect. I'm using a variant of cProfile to measure the time spent on form.clean() and form.save(). It takes <0.1 seconds to run form.clean(), then ~10 seconds to run form.save(), then calls get_success_url(), and then hangs for another ~30 seconds before loading the success_url page. The success_url page should take negligible time to render.
What's eating up the mystery 25 seconds?