JSF URLs are not used the same way as most other webapp frameworks use them. They are more like session handles than absolute resource locators, which is why a postback operation doesn't return with the new page's direct-access URL in the browser toolbar.
The mechanism works just fine as long as you realize that a direct URL and a 'session handle' URL are not the same thing and you don't set up brute-force hyperlinks and expect that they'll contain the JSF session information (which is NOT the same thing as HttpSession!). A Session handle only works when submitted via POST, not GET, since the postback includes the JSF session information as part of the POST data stream.
You can forcibly update the displayed URL in the toolbar using the <redirect/> navigation option, but there is extra overhead when you do that.
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Tim's explanation is excellent, if you need to refresh the address you must you redirection, it's slow, however the redirection gives the browser a chance to update it's adress field.
Here I give you a examples of how to use redirection
In the <h:commandButton>
And if you're using navigation rules you need to add the <redirect/> in the section <navigation-case> of your faces-config.xml file, for example
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You're right the redirect option causes the client browser to make a new HTTP request for the specified view as opposed to just rendering the response without requiring a separate HTTP request. Regarding the performance, using a redirect will terminate the current request and cause a new request - response cycle to occur. If the page has a very large set of components, this could have a noticeable performance impact. Redirects can also necessitate an extra round trip to reinstantiate any request-scoped objects that have disappeared by the next request.