A config setting used to control the use of memory when processing large collections of tiddlers. The default value is:

    'collections.use_memory': False,

meaning that during processing only one tiddler object will be active in memory. This means that sometimes a tiddler will be read from the store multiple times per request.

When True the tiddlers are kept in memory. This saves potential additional reads from the store at the expensive of using quite a lot of memory.

If you have lots of space memory this is probably useful, otherwise, better to leave it False.