follow-cache-command-list

follow-cache-command-list is a variable defined in `follow.el'.
Its value is

(next-line previous-line forward-char backward-char right-char left-char)

Documentation:
List of commands that don't require recalculation.

In order to be able to use the cache, a command should not change the
contents of the buffer, nor should it change selected window or current
buffer.

The commands in this list are checked at load time.

To mark other commands as suitable for caching, set the symbol
property `follow-mode-use-cache' to non-nil.