[Andreas]

PHP Code:

$filestuff = @file_get_contents('/proc/loadavg');
$loadavg = @explode(' ', $filestuff);
if (trim($loadavg[0]) > 5) {
  $bbuserinfo['forumpermissions'][ID] = 0;
  define('SERVER_OVERLOADED', 'yes');
} 


Then in Template STANDARD_ERROR

<if condition="SERVER_OVERLOADED == 'yes'">
Your Overloaded, Sorry, Visit later Text here
<else />
Prior Content of STANDARD_ERROR here
</if>