You can speed up the access to nodes of a large Info file by
giving it a tags table. Unlike the tags table for a program, the
tags table for an Info file lives inside the file itself and is
used automatically whenever Info reads in the file. To make a
tags table, go to a node in the file using Emacs Info mode and
type M-x Info-tagify. Then you must use C-x C-s to save the
file. Info files produced by the makeinfo command that is part
of the Texinfo package always have tags tables to begin with.
Once the Info file has a tags table, you must make certain it is
up to date. If you edit an Info file directly (as opposed to
editing its Texinfo source), and, as a result of deletion of
text, any node moves back more than a thousand characters in the
file from the position recorded in the tags table, Info will no
longer be able to find that node. To update the tags table, use
the An Info file tags table appears at the end of the file and
looks like this: ^_^L Tag Table: File: info, Node: Cross-
refs^?21419 File: info,