RSS Feed/News Page takes long time to load or times out, after admin or moderator logs in.

[ENXF NET]

After an administrator or moderator logs in, the resulting page will take a very long time to load, and usually caused time out.
But no issues for regular users.

I notice this SQL that is stuck in executing for several minutes

SQL:

SELECT `xf_post`.*, `xf_thread_Thread_1`.*, `xf_forum_Forum_2`.*, `xf_node_Node_3`.*, `xf_permission_cache_content_Permissions_4`.*, `xf_user_User_5`.*
            FROM `xf_post`
            LEFT JOIN `xf_thread` AS `xf_thread_Thread_1` ON...

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