This isn't as useful for the Geneis, but could be useful for the Sega CD/32X, Saturn or, Dreamcast:
Echidna data linker is a system of linking all of your files into one big file, that gets loaded from the CD. This should cut down on load times, as long as the file will fit in available memory.
http://elibs.sourceforge.net/mkloadob.html
The Sub CPU, on the Sega CD, should be able to load the file, and either transfer it to the Main CPU, or handle file requests for the Main CPU.
Echidna data linker
Moderator: BigEvilCorporation