I’m Yahoo! Small Business Hosting service customer. And my web site is developed in PHP. Unfortunately performance is quite slow and I was wondering why so I checked the PHP info which shows:
PHP Version: 4.1.11
Zend Engine v.1.3.0

A key factor in the performance jump is the Zend Engine 2, the heart of the PHP language. PHP5 is just faster than PHP4. So why Yahoo! is not upgrading to Zend Engine 2 and PHP5 while other hosting companies already have done it ages ago?