Today I created the first release in the new unstable series. It introduces a sqlite backend and simple comment feed support. This release is intended for development purposes only, so that one can compare 1.2.x and 1.3.x performance. I invite everyone interested in getting Liferea faster to have a look at the DB schema (src/db.c) and the current access patterns. Reviews!!!
If you want to try 1.3.x you can run it without influencing 1.2.x. It will create an own cache directory ~/.liferea_1.3 and migrate the 1.2.x cache automatically on the first startup (which might take some seconds).
This release is not intended for production. It is missing several features (searching, search folders...), that I hope to add in the next weeks again. For testing you should be able to use the basic feed reader features.