Let's say you use your home computer for dialing up the system that runs Emacs and Gnus. If your modem is slow, you want to reduce (as much as possible) the amount of data sent over the wires.
nilto inhibit Gnus from re-centering the summary buffer all the time. If it is
vertical, do only vertical re-centering. If it is neither
vertical, do both horizontal and vertical recentering.
Use the following to enable all the available hiding features:
(setq gnus-treat-hide-headers 'head gnus-treat-hide-signature t gnus-treat-hide-citation t)
nil, you can make all the windows smaller. While this doesn't really cut down much generally, it means that you have to see smaller portions of articles before deciding that you didn't want to read them anyway.
nil, all threads in the summary buffer will be hidden initially.
nil, Gnus will not put information in the buffer mode lines, which might save some time.