If you have more than 50 Child Sites connected to your Dashboard, we recommend to turn on the Optimize for big networks option. Go to MainWP > Settings page and locate the Global Options options box. Set it to YES and click Save Settings button in the bottom of the page:
With this option enabled, your Dashboard will work faster. Updates will be cached for quick loading.
[box]
A manual refresh from the Dashboard is required to view new plugins, themes, pages or users.
[/box]