[MM3-users] It takes a very long time to display the list archives

When I try to display the archives of any list in my mailman3 installation it takes forever for it to display. We are talking a good three or four minutes. It doesn't matter if there are 100 messages in the archives or just one. We are using postgres for the mailman3 and django databases. On the server, when I click to display a list's archives, I see the process "gunicorn: worker [gunicorn]" is using nearly 100% of available CPU.