Atomiswave 3D polygon backgrounds demand more CPU processing than classic 2D sprites.
This hardware shift means — it requires an Atomiswave emulator or a MAME build with Atomiswave driver support. metal slug 6 mame 0139u1
Game loads but runs at 40% speed.
Follow this sequence to ensure the emulator indexes the game files correctly: Atomiswave 3D polygon backgrounds demand more CPU processing