OOP in PHP and Performance issues

When began with PHP, I used to write quick scripts, procedural, which served very well the small projects. But when uses OOP designs with PHP, I noticed the BIG difference in performance which went bad with the OOP.

PHP was not designed to be an Object Oriented Programming language, although there are very respectable attempts to make it so. I just thought about the future of the Object Oriented Design with the PHP, which is narrow in my opinion.

So why programmers should use PHP for OO designs while there are other languages such as Java?