I have tested on two laptops how well batocera is working and on the stationary PC with high/mid end GPU and 8gb of ram. First was the Acer E1 series, with nvidia GT 720m and 4 gbs of ram with I3.
Most of the games run with no issues, the only one that I have found did do well was Budakai tenkaichi 3 (but the Budokai 3 ran smoothly) was stutering a lot, menu worked fine untill we went to combat, combat was a tops 10 - 13 fps. Unplayable.
Second was Asus EEE PC 900, it had issues starting batocera, it just did not boot to the end was stuck and kind of loading with the underscore mark showing
Third was station PC with gigabyte RX580 GPU, all games ran smoothly and will run smoothly for sure.