CiviCRM Community Forums (archive)

In http://civicrm.org/node/150 you caution against creating more than 20 custom fields per object. Is this constraint still true (the posting is pretty old)? I assume you mean total number of custom fields, across groups? What is the recommended limit on number of custom groups?

No that limit is no longer valid. That limit was for the previous implementation of custom fields (which used a thin table to store all custom values). the new implementation is more scalable. No idea on a recommended limit on number of custom groups etc. This will only be a bottleneck during search/export if you are retrieving values from lots of different custom groups. In this case you'll hit the mysql LEFT JOIN of 64 tables

lobo