Quote Originally Posted by Bitto View Post
Sometimes yes, sometimes no. The two APIs QCanvas and Graphics View are similar enough in behavior and API to be compared like this, that's only reasonable. But the same code might not be as fast in one as the other, although often tweaking the slow one will bring them up to the same level.
But both sit on a QPainter. In Qt3 QPainter was a thin wrapper around the native graphics library ( X1, ...), in Qt4 we run through Arthurs render pipeline.

Although the performance of Qt4 has been improved a lot from Qt 4.0, Qt4 applications feel fat. ( F.e. when scrolling an empty scroll area, the handle of the scroll bar can't follow mouse movements. ) The new release of our product has recently been ported to Qt4, what makes it possible to compare - and the result is not very appealing.

I remember a discussion at the first Trolltech Days, where I was told, that the effects of modern desktops have priority and the performance issues will be obsolete, because of hardware improvements. But today people (including me) are looking for fanless, less power consuming office systems.

Uwe