Manage Domains > Edit Web Hosting > Web Options > Php Mode..
My phpbb forum use PHP 5.2.x FastCGI (old, not recomended). If I change it to PHP 5.3.x will work better? how this affects my forum or a website?
I am using 5.3 and it does work better. The features are still the same but things seem to run faster and the new version has a short learning curve as well.