Bug 61950 [Markers] Images being created twice potentially
org.eclipse.ui.views.internal is using a static called ImageFactory which has it's own ImageRegistry. It should use JFaceResources.getImageRegistry to be sure that images are not being created twice (Image creation can be very expensive). I am not sure that this is a problem currently with performance but it could add to start up time.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/FiltersAction.java
private MarkerView view;
    /**
     * Creates the action
     */
    public FiltersAction(MarkerView view) {
        super(Messages.getString("filtersAction.title")); 
        setImageDescriptor(ImageFactory
                .getImageDescriptor("elcl16/filter_ps.gif")); 
        setToolTipText(Messages.getString("filtersAction.tooltip")); 
        this.view = view;
        setEnabled(true);
    }
    /**
     * Opens the dialog. Notifies the view if the filter has been modified.
     */
    public void run() {
        view.openFiltersDialog();
    }
}