Compared to customized images like Supreme GPi, Recalbox isn't quite there yet in terms of performance on the GPi case.

Don't get me wrong, I love Recalbox, I have both my home arcade and a custom mini cab running it, but this beta doesn't cut it IMHO.

Let's give time to the devs, in a couple of weeks/months it should be as good as usual.

I agree that RG 300 is a pretty neat device, I also own one. But indeed the GPi screen has much better contrast, also I hope to obtain better PSX emulation with it.