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performance hits where <a class="link" href="gtk-Types.html#GtkArg" title="GtkArg"><span class="type">GtkArg</span></a> structures have to be converted into <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a>s.
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<div class="refsect2" title="What are signals?">
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Signals are a way to get notification when something happens
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and to customize object behavior according to the