Why is the setup of an OSPF neighbor relationship between S series switches on a broadcast network slow

On a broadcast network, when two devices establish a 2-Way OSPF neighbor relationship, they elect the DR and BDR. Generally, the DR and BDR are elected after the Waiting timer expires, and the default value of the Waiting timer is 40s. Therefore, the setup of a Full OSPF neighbor relationship requires about 1 minute.
Advertising a route to a loopback interface is useless. This is because a loopback interface cannot connect to a physical network, and traffic to a network segment cannot be routed to a loopback interface.

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