Hi there.
Regarding
https://github.com/SFML/SFML/wiki/Tutorial%3A-Integrating-SFML-into-Qt , I think one could suggest changing the constructor
QSFMLCanvas(QWidget* Parent, const QPoint& Position, const QSize& Size, unsigned int FrameTime = 0);
such that default value is
unsigned int FrameTime = 1000/frames_per_second
or something alike.
The reason is that with a zero FrameTime, at least in my case (Windows 7), the program uses a whole lot of CPU time without actually doing anything. Changing it to a value like 1000/60 drastically reduces the CPU usage, and 60fps should be really enough for drawing in a GUI.
If you agree, you could update the tutorial (I won't as I don't want to register there), however, if my suggestion is not reasonable, please explain.