This displays the speed of reading through the buffer cache to the disk without any prior caching of data.
The Netscape proxy server is also the first commercial caching proxy server.
It also prevents game developers from stretching the Xbox 360's limits by caching data to the hard drive in the form of virtual memory - something every PC does with regularity.
Other examples of proxy servers are "caching" servers, which basically download large portions of the Internet every day in order to speed up the download process for people using their connection.
These proxies may be in order to filter and position content for members of a group such as AOL, providing a specific kind of experience and sometimes "caching" content so that sites will load more quickly.