Bug 95672 Focus changes slow when java browsing perspective open
To reproduce: 1. Run Eclipse in your favorite profiler 2. Open the Java browsing perspective 3. Profile the time taken to switch between java editors On my system, approx. 50% of the time is spent in JavaBrowsingPart.partBroughtToTop. Notice that this method continues to dominate activation changes, even when another perspective is active and no java browsing parts are visible.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/browsing/JavaBrowsingPart.java
* Creates the search list inner viewer.
	 */
	public void createPartControl(Composite parent) {
		Assert.isTrue(fViewer == null);
		fTypeComparator= new JavaElementTypeComparator();
		
		fViewer= createViewer(parent);
		initDragAndDrop();
		fLabelProvider= createLabelProvider();
		fViewer.setLabelProvider(createDecoratingLabelProvider(fLabelProvider));
		fViewer.setSorter(createJavaElementSorter());
		fViewer.setUseHashlookup(true);
		fTitleProvider= createTitleProvider();
		createContextMenu();
		getSite().setSelectionProvider(fViewer);
		if (fMemento != null) { 
			restoreLinkingEnabled(fMemento);
		}
		createActions(); 
		addKeyListener();
		if (fMemento != null)
			restoreState(fMemento);
		getSite().setSelectionProvider(fViewer);
		
		IStatusLineManager slManager= getViewSite().getActionBars().getStatusLineManager();
		fViewer.addSelectionChangedListener(createStatusBarUpdater(slManager));
		hookViewerListeners();
		
		addFilters();