When recording, viewfinder stream lags 3(!) seconds behind the actual stream and the viewfinder stream FPS (frames/sec) is about 1

Currently, no camera app can be created for Nokia N8 using the Qt Mobility API, because the 3-second lag of the viewfinder stream makes it impossible.

For example, if the user tries to follow a moving object with the camera (to keep it within the screen all the time) it is absolutely impossible, because the object usually leaves the screen 3 secs before the user notices and moves the camera accordingly (again and again).

To make things even worse, the refresh rate of the viewfinder video stream is only about 1 frame/sec (1 refresh per second).

Note that I'm not using a debug version but the release version of the Qt app.
What might play a role here is that I use QGraphicsVideoItem instead of QCameraViewfinder to workaround the bug http://bugreports.qt.nokia.com/browse/QTMOBILITY-1190 (it is possible that using QCameraViewfinder will prevent this issue when the bug QTMOBILITY-1190 is fixed).

Finally, it cannot be stressed enough that this bug MAKES IT IMPOSSIBLE to create a usable camera app based on Qt Mobility.
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Thank you for looking into this.