woman-cache-level

woman-cache-level is a variable defined in `woman.el'.
Its value is

2

Documentation:
The level of topic caching.
1 - cache only the topic and directory lists
(the only level before version 0.34 - only for compatibility);
2 - cache also the directories for each topic
(faster, without using much more memory);
3 - cache also the actual filenames for each topic
(fastest, but uses twice as much memory).
The default value is currently 2, a good general compromise.
If the `woman' command is slow to find files then try 3, which may be
particularly beneficial with large remote-mounted man directories.
Run the `woman' command with a prefix argument or delete the cache
file `woman-cache-filename' for a change to take effect.
(Values < 1 behave like 1; values > 3 behave like 3.)

You can customize this variable.