Each code friend
In OpenGL scene, I only show a text, real-time refresh the frame rate, then the other 3 d and 2 d all hidden nodes (about 8-9), but the PC frame rate is very low, has more than 50 frames, delete all the hidden nodes, and frame rate immediately back to more than 300 frames, preliminary conclusion is that the hidden nodes can not occupy the GPU overhead, but it may take up memory and CPU resources, when rendering the scene or including the hidden nodes, but no display, scene of the time and no hidden because node actually led to the decrease of the frame rate, less I did not open the OpenGL or some sort of optimization, can reduce the time of the drawing scene, given my younger brother, hope you friends do not laugh,