It may take time to show a list of network folders/network printers. For example, when I try to add a network folder to N7100, it is getting data for a long time.

Example:

It may take 30 seconds to resolve name through DNS. Please check the network environment (DNS server) for instant DNS name resolution. Also, please check the DNS settings configured on DHCP server in case that you obtain IP addresse from DHCP server.