I've been working a lot with GLCDs these days, monochrome and RGB of various types and sizes. All of them have been coded in C and for other processors. They need a lot of Code space to store the bitmaps and a lot of raw speed to transfer them to the GLCD. I have seen some LCDs / HMI(human machine interface) modules that just send a code to show a screen; but, those are pretty expensive. This display seems to be in that class.