[ Thanks to Borys
Musielak for this link. ]
“It seems that KWin Composite effects are enabled by
default. You can notice shadows under windows and the animated
windows’ minimization. Available features from Compiz Fusion allow
one to point at the left top corner of the screen you are starting,
or something similar, and to use the Scale plugin. Switching
between windows using Alt+Tab displays thumbs of the windows. Quite
interesting is the fact that KRunner looks different from when the
Composite effects are disabled.”