QPixmap and QLabel performance

[high_flyer]

I am worried about performance in this case, because I expect operations of loading graphics, moving it and hiding to be slow.

this is not an issue if you use resources.
Have a look at Qt resource system.
http://doc.trolltech.com/4.7/resources.html
This way the image files are compiled in to the exe and you don't have to worry about loading from disk.