I have very strange issue, when administrator of my website ( http://wordpress.p185034.mittwaldserver.info ) get log in at back end, unexpectedly forum page at front end ( http://wordpress.p185034.mittwaldserver.info/forum ) takes too much time to load.
Normally it takes 5 secs to load the forum page when admin is not logged in, but when admin get log in at back end it takes 19 secs to load.
Any help will be really appreciate.
Thanks in advance.