* max_batch_queue - Default value is 1000.
* max_processes_backend - Maximum number of concurrent database processes for background tasks. Default value is 5.
* max_processes_frontend - Maximum number of concurrent database processes for foreground tasks. Default value is 20.
+* memcache (Boolean) - Use memcache. To use memcache the PECL extension "memcache" has to be installed and activated.
+* memcache_host - Hostname of the memcache daemon. Default is '127.0.0.1'.
+* memcache_port- Portnumberof the memcache daemon. Default is 11211.
* no_oembed (Boolean) - Don't use OEmbed to fetch more information about a link.
* no_oembed_rich_content (Boolean) - Don't show the rich content (e.g. embedded PDF).
* no_smilies (Boolean) - Don't show smilies.