XenForo 2.1.1 is now available for download. We recommend that all users using the previous version of XenForo 2.1 upgrade to this version to improve stability.
List of changes: https://xenforo.com/community/threads/xenforo-2-1-1-add-ons-released-plus-xenforo-importers-1-2-0.162332/
Make some improvements in the import structure. It is noteworthy that it is now possible to import multi-threads to better use multi-core processors. If you start importing through the CLI and adding the –process option with a value of more than 1, then some PHP processes will be used to import instead of a single CPU core used in PHP by default. Your results may vary, but with the number of processes set equal to the number of physical cores on a server that is strong enough, you will see a significant increase in performance.
You can also run import commands with new options – complete, which will start the rebuilding phase automatically