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.
https://bugs.dolphin-emu.org/issues/7104 https://bugs.dolphin-emu.org/issues/8452 https://bugs.dolphin-emu.org/issues/9040 https://bugs.dolphin-emu.org/issues/10554 https://bugs.dolphin-emu.org/issues/10059 https://bugs.dolphin-emu.org/issues/10155 https://bugs.dolphin-emu.org/issues/10324 https://bugs.dolphin-emu.org/issues/10758 https://bugs.dolphin-emu.org/issues/10759 https://bugs.dolphin-emu.org/issues/10930 https://github.com/dolphin-emu/dolphin/pull/5702#issuecomment-318903278 https://github.com/dolphin-emu/dolphin/pull/5717 https://forums.dolphin-emu.org/Thread-big-brain-academy-problem https://forums.dolphin-emu.org/Thread-netflix-instant-streaming-disc-testing https://forums.dolphin-emu.org/Thread-wii-new-carnival-games?pid=469822#pid469822
JosJuice