gnus-agent

gnus-agent is a variable defined in `gnus.el'.
Its value is

t

Documentation:
Whether we want to use the Gnus agent or not.

You may customize gnus-agent to disable its use. However, some
back ends have started to use the agent as a client-side cache.
Disabling the agent may result in noticeable loss of performance.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.