I don't really think there is a speed benefit. Your cookies are automatically sent with every request to the site, so there really isn't much going on there.
The only reason I can think of to use sessions would be so you don't have to use cookies. So, if we are going to use cookies at all then there really isn't a need for sessions.
You can do persistant connections with PHP, no need for sessions for this. Don't have the variable put into the config yet, but it will be.
There would be quite a bit of file I/O on heavy traffic sites if sessions are used. Right now I'm just going to port with the cookies until I gain more knowledge in this area and can see a real benefit.
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Scream
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