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Joomla is a really nice platform overall, but overkill and probably inappropriate for what you guys are doing with WP. Joomla isn't popular in adult because it takes more effort to build that sort of site, and WP owns the lower end of CMS with a single manager and relatively simple features.
WP has come a long way in the last few years (no more weekly security updates!) and for the most part you don't have to modify core WP files to make your extensions work, but don't get carried away. WP has clear roots in blogging, and feels like a blogging platform to use. Joomla is a CMS from the core, and provides a pretty complete framework to build applications.
BTW - If your PHP sites are slow, try an opcode cache.
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