Background blur: added warning about performance issue.

Signed-off-by: Mavridis Philippe <mavridisf@gmail.com>

src/komposepreferences.cpp

@@ -169,7 +169,7 @@ KomposePreferences::KomposePreferences()
   page2Layout->addWidget(imageEffects);
 
   blurBackground = new TQCheckBox(i18n("Blur desktop background"), page2);
-  TQString blurBackgroundHelp = i18n("Apply a Gaussian blur to the desktop background.");
+  TQString blurBackgroundHelp = i18n("Apply a Gaussian blur to the desktop background.\nMight make your machine considerably slower.");
   TQWhatsThis::add( blurBackground, blurBackgroundHelp );
   TQToolTip::add( blurBackground, blurBackgroundHelp );
   page2Layout->addWidget(blurBackground);