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Hello

I have a friend that has the http://www.zdn.gr/ and he told me that his server provider complains to him that when a user try to view the site it opens a session on the server that takes almost 700mb per session and that makes the site slow and makes problem with the server resources.

My friend ask me what he can look and do in order for the site to be more effective and fast.

Thanks in advanced

700 MB

i doubt that number.

I tested your site and it took 9 sec to load. You should opt for PHP caching. APC is good. Will help you to reduce server usage.
I Guess you are using VPS with atlease 1 GB ram.

Only install extension that are essential, because sometime badly coded extensions consumes lot of resources for nothing

The biggest issue with the load time on the page is linking to large sized images. For example I found one single image that is over 2 Mb. Second, the site does not make good use of caching through htaccess. You can also make some speed improvements by moving your less essential js out of the head.