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Tags are meant to be a restriction on the coder in an attempt to keep proper MVC seperation. I'm not aware of any performance difference, it's just that there are things you can do with tags at times that it's hard to emulate otherwise. For instance, the jsp:forward tag will keep the requested document in the address bar, whereas the redirect the address will change. The reason being that the jsp:forward is actually the same jsp as requested, it's just that further processing is forwarded to another jsp, whereas the redirect prompts the client to request a new document.
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