If you still have and use a G3-based Macintosh and are looking for an optimized version of DOSBox, look no further. Marcus Herbert has put together an “Inofficial DOSBox build for G3 Macs“.
Quoting Marcus:
Unfortunately the official 0.70 build of DOSBox for OSX has all kind of compiler switches set to juice the most performance out of your PowerPC G4 (and up) CPU and obviously doesn’t run on old G3 anymore. For those people I provide a precompiled DOSBox binary here.