Are namespaces bad for performance? (PHP)

I've made some changes for a php framework to suport namespaces and the result wasn't as expected. For a simple test (mostly framework classes loaded) the execution time slowed down with ~10%.

From your experience, is it worth it to use namespaces on large apps (considering the actual development level of PHP)?

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The accepted answer on php namespace benchmark is a good way of looking at this.

I would use namespaces in pretty much any OO application I write in PHP now, it saves a lot of headaches (especially in larger projects) with clashing names. You just need to be aware of the limitations of namespaces in PHP.

http://www.php.net/manual/en/language.namespaces.faq.php

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