Slow performance when listing members.
See https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/KZYQIZRI2LXFVNX5NFXE3ECYCCTTGEK5/ for more detail and a possible solution.
See https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/KZYQIZRI2LXFVNX5NFXE3ECYCCTTGEK5/ for more detail and a possible solution.