Mine never has that issue just slow down but maybe try changing your graphics settings and do not disable sound disabling sound can speed things up so if you are this may fix it :) other people will probably have better answers but here is mine x3

Also dsmume is a really inaccurate emulator anyway so that might also be having an effect :)

Hey VirginiaReaper, can you please send me your run? Maybe I can tell how it happened