Liferea is very slow when it comes to loading entries with comments attached.
For example, loading this post http://www.techdirt.com/articles/20091001/0313526384.shtml (about forty comments at the moment) takes about 7-8 seconds with heavy disk activity. During this time, Liferea is unresponsive, which is quite irritating, as posts with images stop loading halfway and it's not possible to scroll further down in a post.
This is a completely fresh setup, so there should be no database problems. I'm using version 1.6.0 of Liferea.