A new version of the Neo Geo emu MDCNG has been released by Warmtoe, here’s the info he posted about it on the forums:

“New in this release, config files (so you can make a single game version if you want and override the default config for a game) – also uses underclocking of emulated CPUs but this is not optimized – if you burn it have a play with the CPUx Speed values and see what settings (for CPUs 0 and 1) give you the best performance.“

MDCNG v2.82 can be downloaded from here.