I believe they're ports of the very compatible and much more accurate SNES9x emulator. The DSTWO emulators are considerably slower despite the much faster processor, because they are far more compatible emulators. That emulator is fairly fast and has sound, but the compatibility is even worse than JenesisDS and so are the graphical glitches. It's similar to the situation behind SnemulDS. JenesisDS is a very good emulator considering the DS' limitations and i'd definitely say it's a very nice effort on Lordus' part, but there are reasons it happens to run so well and there exist issues that likely can't be corrected so easily (or perhaps at all) due to the methods by which it was programmed. There was a port of Picodrive to the DS that was a similar situation regarding the speed.
STOP SEGA CD EMULATOR FROM BEING CHOPPY FULL
It required a frameskip of at least 2 or 3 to get running at full speed. Because it was software-based, it ran quite slow, much slower than later versions of JenesisDS that eventually supported sound.
STOP SEGA CD EMULATOR FROM BEING CHOPPY SOFTWARE
There was actually an earlier version of JenesisDS that came in a software variety (well before sound was implemented), its compatibility was apparently better and it didn't suffer from as many graphical glitches (it also supported scaling the sides of the image and not just the top and bottom). The reason Genesis emulation on DS is so fast is because it's a hardware based emulator as opposed to software. The rest of my post is directed more towards the topic creator and others as i'm sure Rydian knows these things already. It has been done in other emulators that I didn't really notice any significant speed or compatibility reductions. But besides just not ever getting around to it before being recruited by Sega, implementing support for games over 3MB in size likely wouldn't have been impossible to do. A lot of the games actually run quite well already, fullspeed or close to it (there are exceptions here and there as well as slowdowns in some games). The speed I don't know about, though I could possibly imagine it being improved. Either way his name is in the credits but he never appeared online since then. It looks like it actually uses a modified version of JenesisDS with some tweaks and fixes here and there. Turned out he had been hired by Sega themselves to create their official Sonic collection on the DS, Sonic Classics Collection. The author Lordus (AKA Stephen Dittrich) disappeared off the net years ago. I think it's probably fair to say that further improvements likely would have been made to JenesisDS had the author stuck with it.
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