Bug 82798 TableViewer internalRefresh is very slow as of 1.19
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
Object root = getRoot();
		IContentProvider contentProvider = getContentProvider();
		
		
		if(contentProvider instanceof ILazyContentProvider)
			((ILazyContentProvider)contentProvider).invalidateElements(0, getTable().getItemCount() - 1);
		
		else{ 
			if(root != null)
				virtualManager.cachedElements = 
					((IStructuredContentProvider) getContentProvider()).getElements(root);
		}
		getTable().clearAll();
		
	}
	/**
	 * Refresh all of the elements of the table. update the
	 * labels if updatLabels is true;
	 * @param updateLabels
	 */
	private void internalRefreshAll(boolean updateLabels) {
		
		
		
		
		
		
		
		Object[] children = getSortedChildren(getRoot());