The results in a nutshell:
– Lightpress has the edge (without any caching plugins) and Textpattern comes in second, then Serendipity and finally WordPress.
– Textpattern comes in first with caching plugins enabled (although there is none for Lightpress).
– Textpattern also generally has a relatively low memory footprint (albeit not as low as Lightpress).
TextDrive Forum: Comparison of TP and WP
Sencer.de conducted WordPress vs. Textpattern – a quick performance benchmark in March 2005, with a follow-up in May.
He also discovered a security hole, back in July 2004, and what’s interesting about that is the way the two core developers reacted: WordPress, Textpattern and Security.