In this post to his PHPJack blog Richard Heyes comments on the trending he's seeing in the Zend Framework and where its future might lie.
I have been critical of ZF in the past because the performance has pretty much been going down every release and I am not the only one seeing this, there have been a number of benchmarks that show this trend. Having contributed to ZF in the past I brought this issue up multiple times both on the mailing list and even during the meetings the past zendcons and it the general response was they where focusing on features not performance.
He points out a few things that were brought up at this year's Zend/PHP Conference & Expo including the performance focus of future releases, a push to 2.0 after PHP 5.3's release and some of the changes that can cause breaks in backwards compatibility.
Be sure to also check out Matthew Weier O'Phinney's response to the post and some of the comments Richard made.