Performance mode is an optional setting intended to improve dashboard performance for organizations that have very high daily task volumes and/or active drivers.
With Performance mode enabled, the admin user and all dispatchers for your organization will have their dashboard filters updated to 'No drivers' and 'No tasks' upon login and each time the page is reloaded. This improves the initial loading speed considerably, and allows the dispatcher to choose precisely which filters to apply to reduce loading time while performing dispatching duties.
To enable performance mode, login as the admin user. Go to the Organization tab in Settings and check the 'Enable performance mode' box.