Bug 82798 TableViewer internalRefresh is very slow as of 1.19
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableViewer.java
/*
	 *  (non-Javadoc)
	 * @see org.eclipse.jface.viewers.StructuredViewer#internalRefresh(java.lang.Object)
	 */
	protected void internalRefresh(Object element) {
		internalRefresh(element, true);
	}
	/*
	 *  (non-Javadoc)
	 * @see org.eclipse.jface.viewers.StructuredViewer#internalRefresh(java.lang.Object, boolean)
	 */
	protected void internalRefresh(Object element, boolean updateLabels) {
		tableViewerImpl.applyEditorValue();
		if (element == null || equals(element, getRoot())) {
			if(virtualManager == null)
				internalRefreshAll(updateLabels);
			else{
				internalVirtualRefreshAll();
			}
		} else {
			Widget w = findItem(element);
			if (w != null) {
				updateItem(w, element);
			}
		}
	}
	/**
	 * Refresh all with virtual elements.
	 */
	private void internalVirtualRefreshAll() {