This setting allows you to enable/disable or modify Faster route suggestions. When you disable this setting, it will completely disable route recalculation or route recalculation notifications.
You can choose to enable/disable auto accepting alternative routes, which is a feature that automatically recalculates a route due to a change in conditions of the route.
You can choose to Enable/Disable just the Sound notifications for Faster route suggestions.
You can also choose what sound type or spoken instruction should the app use to notify you when it finds or recalculates a faster route.