If you want to make sure that your customers are getting enough bandwidth, you may want to set a minimum amount that will be guaranteed for the network. To deal with this, navigate to Configuration->Wireless Configuration. You should see Minimum Guaranteed Public Bandwidth with a slider bar. Here you can set a minimum on how much bandwidth the whole public network will get. If guaranteeing a minimum bandwidth is not a concern, slide it all the way to the left to disable this feature. In contrast, if you want to limit bandwidth for individual users, you should go to QoS Bandwidth. Here you can set the max amount of bandwidth an individual user can have. If you do not want to set a limit to individual users, slide the bar all the way to the left to disable this feature. Once you are done, be sure to click Save and OK to save and reboot your router.