When your wiki gets large - a thousand pages, say - viewing the folder contents in the ZMI becomes slow and memory-intensive. It's a good idea to move your wiki to a BTreeFolder? at this point. It may have some benefit for viewing performance also.

In principle this is a straightforward process: use the ZMI to copy your old folder's contents to the new one, and replicate other settings. In practice it can be tricky. Procedure:

I think that covers it. After you're happy all is well with the new wiki, you can delete the old one.