At least on Android, SyncGPU has really bad performance compared to
single core. It's less stable too - I get fatal GPU desyncs in
Pokémon XD using the default settings.
Red Steel 2 has FMVs that get corrupted with Anisotropic filtering. It
also hangs on dualcore. While SyncGPU works, both another user and
myself saw much smoother gameplay when using Single Core for unknown
reasons.
