Did you notice the last changes? Website is slightly faster than before thank to the new AJAX global stats which retrieves real-time stats only when you click "Global Stats" menu. We also coded a self made mod_deflate for Apache server which now compresses almost all data.
Now trying some 'mysqlnd' cache technique for user's stats on dashboard.

By the way I've noticed that Mozilla Firefox is 5 times faster than Chrome on loading.