More or less, what features should my PC have to play some games in this emulator?. It is to more or less have an idea.
As far as CPU goes, Citra relies on single core performance the most. It should score at least a 1800 in this graph.
OpenGL 3.3 compatible GPU.
(Recommended 4.3 or 4.6 compatible as they have done extensions that can speed up Citra by around 5-10%)
Min 256 MB RAM.