Big should it be? What kind of architecture
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Mean delay: 
During initial cache building phase, it’d start with misses only. Architecture with a proxy server and a DMZ A proxy acts both as a client and as a server. Basically it is an agent: It is seen a server to client, and a client to server. DMZ = Demilitarized Zone. 
Proxy is a firewall. DMZ is a repository of non-critical documents. Important parameters: hit-ratio at the local client-side cache. What should move into DMZ? How much bandwidth for DMZ, for firewall? How well would a proxy scale? Software contention in a server. Issue: A server has 4 threads to serve application processes. What should be the system load beyond which we shouldn’t venture? 
Once the threads are all utilized, request queue starts to build up. Typically, residence time of a request at the first subsystem would appear as a function of load (number of requests submitted) as follows: 
Total residence time for a request,  is always
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