It seems like whenever I play a graphic-heavy game on my R4 it has some slow-downs. When I was playing the Sims 3 today, whenever I rotated the camera around it felt sluggish. I searched around for gameplay videos on YouTube and when they rotated the camera it was INCREDIBLY smooth. Same thing for Call of Duty. Whenever I try and look around or even move it's sluggish. Is it the R4, the MicroSD card or maybe even my DS?