Bug 181061 [Viewers] JFace viewers performance issues in 3.3
A number of the JFace performance tests are red since I20060926-0800.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
elementOrTreePath = parentPath.createChildPath(element);
			} else {
				elementOrTreePath = getTreePathFromItem(item);
			}
		}
		return isExpandable(elementOrTreePath);
	}
	
	protected void labelProviderChanged() {
		
		Control tree = getControl();
		tree.setRedraw(false);
		
		internalRefresh(tree, getRoot(), false, true);
		tree.setRedraw(true);
	}
	/**
	 * Creates a new item.
	 * 
	 * @param parent
	 *            the parent widget
	 * @param style
	 *            SWT style bits
	 * @param index
	 *            if non-negative, indicates the position to insert the item
	 *            into its parent
	 * @return the newly-created item
	 */
	protected abstract Item newItem(Widget parent, int style, int index);
	/**