There are no add-ons installed! only 30k threads and 3 users
SELECT `xf_thread`.*, `xf_forum_Forum_1`.*, `xf_node_Node_2`.*, `xf_user_User_3`.*, `xf_permission_cache_content_Permissions_4`.*, `xf_user_LastPoster_5`.*, `xf_thread_read_Read_6`.*, `xf_forum_read_Read_7`.*
FROM `xf_thread` FORCE...