Generally speaking, the end user will not notice the difference between a request
               directly to an Internet site and a request processed through the URL Filter.
            Users within an organization frequently visit the same sites; depending on how you
               have set it up, you can have IWSVA leverage a local cache. The local cache can quickly
               evaluate frequently visited sites instead of having to send a request to the external
               service point.
            Typically, the service point will respond with a rating before the agent has started
               to receive the target page from its host server.