After I log in, Docspell goes into a bit of a tornado, and will attempt to "add account to local storage" (from browser console) multiple times a second:

These are calls to /api/v1/sec/auth/session, causing the auth cookie and also the account data in local storage to change every time, as a new token is received. And megabytes of data to be transferred within minutes.

There is no way to stop this, other than to close the tab.