Hi Sandy,
after having looked through your server config i can not see any misconfiguration so far. I also went to your page. Your start page is HUUUUGE but it loads very fast. But when i go to your forum page there are 2 small stops during the load of the page. I would like to know why this is happening.
Could be due to too much queries or wrong code. I would suggest that you install this hack from Teck
https://vborg.vbsupport.ru/showthrea...ght=microstats which will give you more information about the PHP and the MySQL load on your site.
In addition to this you will see which template is not cached and you can solve this afterwards.
So please install this hack and then we talk again. I think the others should agree to this rather then digging in the dark we should start to find the cause for this. Perhaps it is only one bad hack which you installed.
Cheers,