CB has been performance tested with 1 million users, 1 million PMs, 1 million connections, 1 million activity entries, 1 million notifications, and 1 million gallery entries. Average performance of all of this on a single profile was around 2s with it becoming significantly slower due to Joomla ACL (a lot of usergroups and view access levels) increasing this to 4s.
I'm not sure what's causing your slow page loads, but it's likely due to a missing pagination parameter and causing something to load all of its entries at once instead of in reasonable batches. Please also be sure everything installed has the latest build releases. Next be sure you've enabled debug mode in Joomla global configuration so you can check performance at the bottom of the page as it's likely a database query causing your performance problem.
Kyle (Krileon)
Community Builder Team Member
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If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
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