Mgba 0.6 core run slow on last retroarch :(

hi people. i’ve tried the last retroarch wii version, and it seems they have made a upgrade on mgba core 0.5.2 to 0.6. unfortunately the last mgba core run slower than 0.5.2 version on wii. Did someone have a last retroarch for wii with the mgba 0.5.2 compiled ??

sorry for my english.