oh hey, some polish retro game site actually has a capture kit and they did some nice videos showcasing N-Gage games (disclaimer: no idea what they're saying) https://www.youtube.com/watch?v=kEL6G8aIae8&list=PLhXONM9sSRGlPDwzR7APaQ3_SA0YkmG3l&index=1
also be assured, the framerate absolutely isn't the fault of the capture kit, some of those games are just really low-res slideshows