Happy New Year folks. And, here's an interesting link to some Joomla! 1.5 performance testing. I find it interesting because

1. Joomla! 1.5 beta 2 was slower than good ol' Joomla! 1.0.13 RC
2. There were discussions of a number of PHP caching techniques which can be applied to any PHP system

The caching techniques covered were "file caching" (which sounded like filebased output buffering aka Cache_Lite_Output to me), Alternative PHP Cache (APC), eAccelerator and Memcache. xcache was mentioned in the comments but not tested.

So if you're interested in a quick overview & comparison of some PHP cachine techniques, go ahead and read the article ... I found it interesting that despite memcache's reputation, its performance fell behind other caching methods.