Help:$smwgFactboxCacheRefreshOnPurge

is a configuration parameter that sets whether or not a factbox should be invalidated on an action=purge event. The configuration parameter was introduced in and deprecated in .CiteRef::gh:smw:3474

Default setting
This means that each purge request (no new page revision) will invalidate the factbox cache.

Changing the default setting
To modify the setting to this configuration parameter, add one of the following lines to your "LocalSettings.php" file after the  call:

This means the factbox cache will be only reset after a new page revision.
 * Disable the refreshing of data when purging a page