Site slowness because of SharePoint STS certificate CRL checking

Assume that you have a web application that uses claims-based authentication in SharePoint Foundation 2010 or SharePoint Server 2010. The SharePoint server does not have access to the Internet, or the server is protected by a firewall that has limited ports open. In this situation, users intermittently experience long delays when they perform certain operations, such as logging in to the site or performing a search. Users may also encounter HTTP timeouts when they perform these operations.

https://support.microsoft.com/kb/2625048?wa=wsignin1.0

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