Window performance problem

[aleksjej]

Hello,

I have a QThread that sends signals to QGLWidget slot function which invokes repaint() at the end. The animation in QGLWidget is OK, but when I try to do something with the window (e.g. Move it using its title bar) it responds very slow to eny reactions. It looks as if the repaint operation is invoked so frequently that the window event loop cannot process its events in appropriate time.

Do you know what`s the cause of the problem? Thanks

[helloworld]

I have not worked with QGLWidget specifically, but for QWidget in general you should use update() rather than calling repaint() directly since calling update() several times normally results in just one paintEvent() call.

We suggest only using repaint() if you need an immediate repaint, for example during animation. In almost all circumstances update() is better, as it permits Qt to optimize for speed and minimize flicker.

Not sure if that helps.