I'm pretty sure I'm using the hardware accelerated version. The pro file contains the OpenGL flag and when I'm painting using OpenGL I get incredible frame rates.

But in my test case I'm not using any OpenGL commands or overpainting at all, I simply replaced QWidget by QGLWidget in my header file. The paintevent method keeps being the same. Doing so it seems my event loop is much slower (I get less keystroke events per time), like there is some overhead by the QGLWidget.

Regards,
André