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I have seen several developers including myself using Session a lot. Session is a wonderful way to keep stuff cached per user in a Web application. But I get scared when I see developers putting large search result into a Session or adding everything from a tiny byte to a large megabyte object. Session will by default be stored in processes, so it will take up the server memory. It's easy to use tools or do a simple math to calculate how much memory my objects will take up times the numbers of users of the system