Since ttrss-reader-fork version 0.5.2 Nils implemented a caching mechanism. Additionally he provided a patch for ttrss’s external API to support the fetch of multiple articles at once with getArticles().
Unfourtunately it did not find its way in the official ttrss code. As the ttrss source code is hosted on github I simply forked the project and added the small needed change to the API.
I do not plan to change other things in ttrss. Tested versions are tagged like tested_2010-08-13.
Update: Nils has now his own ttrss-fork on github. Therefore my fork is not longer necessary and I will delete it.