Maybe now we'll see some more optimised core code.
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Optimized code ? Specific to OpenDingux devices ? I would lower my expectations.
The only thing that could benefit from an official libretro port is TempGBA with its dynarec MIPS.
That one fixed issues in games like Kingdom Hearts and other games. But you have to keep in mind that in most/some cases, some libretro ports are going to suffer from some overhead by its nature.
It also won't play as well with PGO it seems (without doing more work or going full on assembly like some cores do).
I'm just saying that people should use retroarch mostly for convenience.
For example support for external controllers out of the box or in some cases netplay if the core supports it.
You can compare the Wonderswan core on retroarch versus my standalone Wonderswan emulator based on the libretro core to see what i mean by that.