Updating WCF service reference taking longer time than usual

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ASP.NET

WCF

I created WCF Llibrary project in .Net 3.5, and I published in IIS.

Another Web project consuming this WCF whuich hosted in IIS.

Problem is, while I am updating the service reference, then service reference gets updated. But it takes longer time(3-4 min) than usual time.

I have tried different namespace in different service and tried changiung endpoint with IP address or localhost or computer name but result is same .

what could be the issue behind.

Please suggesst some solution ,

Appreciate your reply