Hi
I like to use overlay option in retroarch to display nice borders when i play 4:3 games on my 16:9 TV.
I was playing street fighter third strike in fba libretro core, it runs full speed at 60 FPS on my Rpi2, even with a simple scanline shader, but when I activate overlay it drops at 48 FPS!
My overlay is just basically an image, how can it have an impact on emulation performances?