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To proove performance is slow you need to compare two forums. As you have not done this your claim is unsubstantiated.
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Last time I did my tests, vb beat out W3T by 40%. Now, granted, that information is over 2 years old and it compaired the perl version of W3T w/mySQL (which was gratiously donated by Scream, and i believe there was no PHP version at the time) to 1.x version of vBulletin.
Like I said in a previous post, I'd be happy to spend the time redoing the tests, if all the companies (IP including) would donate a copy of their software for these tests.
As for myself, I still have various copies of UBB 5.x, phpbb 2, vbulletin 2.x, and microsoft discussion webbot all in use on different sites. Different options for different needs. If one program suits your need, go with it... If another does something better, than go with that program... Each time I need to evaluate any program, I base it on the needs of *that* site, not anyone elses.