A cache maintained by Internet Information Services (IIS) that stores file objects that are frequently requested by the World Wide Web (WWW), File Transfer Protocol (FTP), and Simple Mail Transfer Protocol (SMTP) services and by Active Server Pages (ASP) applications. The IIS Object Cache contains handles for open file objects, directory listings, and other frequently used file system objects. The cache runs within the main inetinfo.exe process and provides improved performance for IIS services and ASP applications.
For performance reasons, you should keep the IIS Object Cache in the working set of the IIS process in RAM. Be sure that you have sufficient RAM to do this. If you don’t have enough RAM, the IIS Object Cache will be paged to disk and performance will be impaired. You can observe the performance of the cache by using Performance Monitor. Look for counters relating to cache hits and cache misses for each IIS service.