The TechFounder blog has a few general tips you can use to help your web pages go a bit faster:

As it might be expected, there are several techniques to optimize the delivery of web pages. The Exceptional Performance guide by Yahoo is a great resource for a multitude of optimizations practices, including specifically two techniques which I will address in this article - script minifcation and concatenation.

Suggestions include reducing total request counts and minification of external libraries via the Minify tool.

Matthew Turland has written up a new tutorial explaining something that isn't "currently very well documented" in the Zend Framework - output filters.

They're mentioned in passing in the Zend_View documentation, but not reviewed in detail anywhere in the Reference Guide as of version 1.5.2. I was curious enough about how to implement markup minification that I decided to trace through the Zend_View source code in attempt to discern how output filters actually worked. As it turns out, it's actually pretty simple.

He explains a simple example of how they work, using a Zend_View object to build the filters on (addFilterPath/setFilterPath), and how he created his own output filter - the Minify filter. A minifier removes the comments and whitespace in the output to help reduce its size.