I tried this but did not see an appreciable performance increase. At the time (~9 months ago) DirectFB had issues with image redraws and artifacting when page flipping and used in my environment.

It may be a function of my platform (CLE266 on VIA M10k-N) but given there did not seem to be much of a "seat of the pants" speed difference I was content to revert to X.org. Might be worth a go on other platforms?