I don't have mine anymore, but what I always used for bench marking snes emulation were some good first gen games, Actraiser and F-Zero. If they play fine, you shouldn't have any issues with horsepower. Actraiser 2 is good for testing special effects, that's fog on level one, not solid white masses blocking your view. Street Fighter Alpha 2 support means it's a very up-to-date emulator with S-DD1 support. And Top Gear 3000 is another good test, it uses the DSP-4 chip on hardware, so only new emulators support it.
I was thinking the pi has issues on the rotating intro for actraiser, but I forget.