Oh well. Hey, just a thought: have you considered maybe porting the DSonPSP build of desmume? It's already optimized to run on slower embedded systems and maybe that could help in making 3ds DS emulation faster. Some games already work at full speed.http://wololo.net/downloads/index.php/download/1235
So, quick update: I took a look at the link zoogie posted, and have been working on porting it. From what I can tell, it's quite a bit faster. Only problem is that the renderer I'm making seems to not want to work properly. It just produces lots of garbled graphics.