What is notmuch compact and should I use it?

[Attic Hermit]

David Bremner <david at tethera.net> writes:

> There is some tradeoff: search should be faster after a compact, but
> indexing many messages will likely be slower.

Maybe I'm wrong, but is it meaning that it will be taking a long time to
compact many messages, or after doing `notmuch compact`, indexing many
new messages will be slower because of the compacted database?

-- 
Attic Hermit