The WAN Acceleration > Web Cache page provides options to configure and monitor the Web Cache service.
The Web Cache feature stores copies of Web pages passing through the network that are frequently and recently requested. So when a user requests one of these Web pages, it is retrieved from the local Web cache instead of the Internet, saving bandwidth and response time. Minimal, Moderate, and Aggressive caching strategies are available, these determine which objects are placed into the Web cache and how long they stay there.