RockNES 3.11 is finally out. This is a major update from the previous release on OS X. Note that game saves have been revamped and are thus not compatible with older versions, however they are much more robust now.

After trying this out for a bit, it's still not as good as Nestopia, but it is faster. The one thing that bothers me about Nestopia though is that the colors are of a different pallette than RockNES. Nestopia is supposed to have the more accurate emulation, but to me, the RockNES color pallette seems to be the correct one. Perhaps I should email Bannister on this to get a definitive answer.