I have used 'ModelTest' from http://labs.trolltech.com/page/Proje...view/Modeltest, hoping it could give me some hint. It is a good tool but it did not help with the performance problem.

I somehow feel that when I append an item at the end of my list everything (all items) get reordered by the view and that this could be the problem. Years ago we wrote a Windows application which is also able to trace communication; this application is still running and it's performance is excellent, no matter how long (how many lines) the trace buffer has. Only problem: it is programmed for Windows so it is not portable.

Is there really nobody who could push me in the right direction? Is there eventually somewhat like 'ModelTest' that could analyze errors which result in bad performance?