For added protection, back up the registry before you modify it. Therefore, make sure that you follow these steps carefully.
However, serious problems might occur if you modify the registry incorrectly.
Important This section, method, or task contains steps that tell you how to modify the registry. Thus, this change will impact browser performance, depending on the logic of the Automatic Proxy Configuration Script used and its size. Note : When you deactivate Automatic Proxy Caching, the browser will follow client-side processing, which could speed up page loading in the browser. If an automatic proxy configuration script is configured to be used and Internet Explorer is able to retrieve it from the network (either if the Automatically Detect Settings option or the Use automatic configuration script are enabled), the Automatic Proxy Result Cache is updated with the hostname being accessed and the complete set of proxy servers returned by parsing the script. If this checks fails, it indicates that this is the first attempt to connect to the host during the current session and the normal proxy detection logic applies. Internet Explorer 5.5 and later first checks the Automatic Proxy Result Cache to determine whether a proxy was used to connect to the host on previous attempts. When you connect to an Internet site, the FindProxyForURL function is used to determine whether a proxy should be used and which proxy to use. The purpose of the cache is to reduce the client-side processing of the automatic proxy configuration script. The Automatic Proxy Result Cache is a performance enhancement that Microsoft added to Internet Explorer 5.5 and later. This prevents you from using different proxies to gain access to the same Web server. The caching mechanism (Automatic Proxy Result Cache) is performed on a host basis (that is, not on an URL basis). When you configure Internet Explorer to use an automatic proxy configuration script, it caches the proxy that is returned by the FindProxyForURL call.