wcf的wcfdualHTTPBinding的调用严重慢的问题

发现有时候需要增加红色部分的内容，调用才不会很长时间

<services>

<service behaviorConfiguration="MyServiceBehavior" name="service.MyPublisher" >

<endpoint address="" binding="wsDualHttpBinding" contract="service.IMyContract" bindingConfiguration="dualHttpBinding">

<identity>

<dns value="localhost"/>

</identity>

</endpoint>

<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />

<!--<endpoint address="net.tcp://locolhost:9999" binding="netTcpBinding"  contract="service.IMyContract" />-->

<host>

<baseAddresses>

<add baseAddress="http://localhost:6678/" />

</baseAddresses>

</host>

</service>