Hi All, I moved my forum from vbulletin 3.7 a couple of days ago to xenforo, and since the move the forum has been running ok one minute and then going really slow to the point of not being able to open any pages. The forum was really quick on vbulletin. Does anyone know if using xenforo will use more server resources and typically be slower than vbulletin? My server spec is pretty powerful, so below : 12 Core: 2 x Intel Xeon E5-2430v2 (15M Cache, 2.50 GHz) Memory 96GB DDR3 Hard Disk Configuration 4 x 4TB SSHD I usuable have around 100 members and about 500 guests online at any one time My server admin person said its the query below which is causing problems, I would be greatful if someone could help as my forum is pretty much unusable for parts of the day. "SELECT post.* , user.*, IF(user.username IS NULL, post.username, user.username) AS username, user_profile.*, user_privacy.*, session_activity.view_date AS last_view_date, liked_content.like_date FROM xf_post AS post LEFT JOIN xf_user AS user ON (user.user_id = post.user_id) LEFT JOIN xf_user_profile AS user_profile ON (user_profile.user_id = post.user_id) LEFT JOIN xf_user_privacy AS user_privacy ON (user_privacy.user_id = post.user_id) LEFT JOIN xf_session_activity AS session_activity ON (post.user_id > 0 AND session_activity.user_id = post.user_id) LEFT JOIN xf_liked_content AS liked_content ON (liked_content.content_type = 'post' AND liked_content.content_id = post.post_id AND liked_content.like_user_id = 1306629) WHERE post.thread_id = '397161' AND (post.position >= 90 AND post.position < 100) AND (post.message_state IN ('visible') OR (post.message_state = 'moderated' AND post.user_id = 1306629)) ORDER BY post.position ASC, post.post_date ASC "