Standalone Yabause has an OpenGL option that allows games to run faster and at higher internal resolution. I can’t find this option in the core version though, is there a way to enable it?
No, that requires making an entirely new core using libretro-gl. Twinaphex plans to rebase the core to use the new GLES3 renderer and bring in some of the improvements from the uoYabause fork but there are some other things that are higher in priority right now.