This cloud wiki setting specifies that, after the first time the wiki serves the stylesheet specified by stylesheet-path to a http client, it should cache the stylesheet in memory for performance reasons. If you are currently trying to improve the stylesheet, this behavior would force you to continually restart the server, a nuisance at best.
It is recommended that you turn on this option for production servers.
You should reboot your server after changing this setting.
This node is a part of the cloud wiki manual.