See http://drupal.org/project/blockcache
I tried it before but did not see much difference, but its easy to try. In D6 block cache is in core.

There is also http://drupal.org/project/advcache
for caching of authenticated users (on site where you have a lot of logged in users like social networking sites) but I haven't used that one yet, I'm curious to hear some comments of people that have used this module.

Hans
www.koba.be


2009/5/13 Adam Gurno <adam.gurno@gmail.com>
Back in the 4.x days there was a caching module for the sidebar
blocks.  I don't know if the 5.x caching includes the sidebar blocks,
but you might want to look into that.

A