Nexus is recording successful connection attempts by anonymous in authorization system feed, which leads to enourmous size of data and index, probably reducing performance...

Size of system feeds on RSO is growing at a very rapid rate, this directory was empty on July 15th.

$ du -s -h *
5.6G	index
4.1G	persist

Looking at the raw data under timeline/persist this is almost entirely due to recording successful "authentication" of anonymous under the "authentication and authorization" system feed.