At this point, Citra is simply not fast enough to run most commercial games at full speed, even if your computer can run the most demanding of PC games just fine.
-The only hard requirement for Citra is a graphics chip that supports at least OpenGL 3.2, +
The only hard requirement for Citra is a graphics chip that supports at least OpenGL 3.3, but you definitely want a processor with the highest possible performance per core.