The messages which have to access via network (e.x. IMAP, NNTP folder) are cached as a local file. The cache file is saved under the directory `~/.elmo/cache'. To expire cache, type M-x elmo-cache-expire-by-size. The command deletes cache files to the specified size by the order of last accessed time.
The messages that are read are kept in the cache buffer. It is called
`buffer cache'. The number of cache buffer is specified by
wl-message-buffer-cache-size.
There are message prefetching mechanism in the Wanderlust that prefetches next message while you are reading.
You can control the message prefetching mechanism by these two variables.
wl-message-buffer-prefetch-folder-type-list
t. In this case, prefetch messages in all
folders.
If it is a list of folder types, it specifies the folder types in which
message prefetching is enabled.
Following is an example (prefetch messages in nntp and imap4 folders)
(setq wl-message-buffer-prefetch-folder-type-list
'(nntp imap4))
In this case, multi folder that contains localdir and imap4 prefetches
only imap4 messages. This variable precedes the value of
wl-message-buffer-prefetch-folder-list.
wl-message-buffer-prefetch-folder-list
nil.
A list of regexp of folders to enable message prefetching.
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