Which is the best php framework in terms of performance?
Travis: awin,You'll see different responses from all different kinds of people to this.  Everybody has a different allocation to the relative weights of different aspects of the system.However, I would advise you to not worry much about application performance.  Focus on programmer performance instead; search through Coding Horror's blog for more info on that.Your difficulty will be reaching the point (in terms of users/loads) where you need to scale.  I mean, how many users would you need before you ran too high of a load on some of the beefy Amazon EC2 instances?  For almost everyone, their app will never reach that scale.Also, scaling the application layer is little more than moving sessions to a database and putting a load balancer in front of your webservers.  DB stuff is a lot harder, but for basic CRUD stuff you're going to be fine for a long while.As far as performance goes, Paul Jones has a blog post (or two) on the performance of some different frameworks.  I think Zend / CodeIgnitor were the two fastest, followed by symfony.  CakePHP was at the end of the list, although the speed difference between top and bottom frameworks was just a factor of 2 or so.  And Cake has seen about a 33% speed up in their codebase since then.In short, don't worry about scaling.  Pick the framework that looks like it will make your coders more productive.