What I saw in cvm Qt sources is a memory inefficiency I am sure I can get rid of (framebuffer is memcpy'ed to a new buffer, which is then used for QImage, which is then used for QPixmap, and that QPixmap is rotated 270 deg when in portrait). And so on, and so on. But I need a working build tree, to be able to play with different options so at the end of a day a simple benchmark could prove is it faster or slower.