This appears to have flared up again and so I was forced to disable the script "/home/palmer/public_html/phpBB3/chat/index.php".
Unfortunately I do not have any specific recommendations for this script, however, in general, adding some sort of caching mechanism, where the script does not need to generate a new page with every request, helps to lower the over load that a script will cause. Likely the original author or support group of the software that you are using will be able to help you to understand how to add something of this nature.