It’s probably worth switching over to RetroArch if you want bezels, to be honest. The versions of MAME and FBA available on the Pi don’t like the new (easily available) layout files, and it’s really hard to get hold of the older ones. The RetroArch versions support a lot of stuff between them and have the benefit of shaders and the like.
I’ve made a guide in a new thread, this should sort you out if you do want to try with RetroArch:
I’d love to add overlays “bezels” to all of the 4:3 aspect systems. But from what I’ve tested, adding an overlay affects the performance. Even on Raspberry Pi 2. So I’ve opted to avoid using overlays. 🙁
rookervik, what systems are you having performance issues with? There’s no reason you shouldn’t have perfect performance on Pi2 with a 1080p overlay. There’s a couple of things you might want to check:
Is your Pi overclocked? I have mine set to the Pi2 setting.
Are you running at an unusual resolution?
Does your retroarch.cfg have video_threaded set to false? This was changed recently in the RetroPie-Setup script to be false by default – however, it was found it negatively affected performance if you were using shaders or overlays. If it’s false, try setting it to true and see if that helps.
Otherwise, feel free to PM me and I’ll see what else I can do to sort you out.