Manual:$wgUseFileCache/pl

Szczegóły
Set to  to activate server-side file caching. This will cache static pages for non-logged-in users to reduce database traffic on public sites.

If  is set to ,   and   will automatically be set to. (Part of that automatically done after r46374.)

Specify where you want the cache files to go in your server filesystem using. You must create the directory yourself though.