Bug 102285 [Import/Export] Project Import wizard unusably slow
R3.1 I wanted to create a new 3.2 workspace and import some projects from my 3.1 development workspace which contains around 120 plug-ins. I've set the root of the importer to point at those plug-ins. After letting the wizard scan my disk for over 10 minutes I gave up and did it manually. A possible source for the problem might be that the root directory (as expected) contains a .metadata directory with tons of data (in my case) and that this one is fully scanned.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardProjectsImportPage.java
try {
					monitor.beginTask(DataTransferMessages.DataTransfer_importTask, selected.length);
					if (monitor.isCanceled())
						throw new OperationCanceledException();
					for (int i = 0; i < selected.length; i++)
						createExistingProject((ProjectRecord) selected[i], new SubProgressMonitor(monitor, 1));
				} finally {
					monitor.done();
				}
			}
		};
		
		try {
			getContainer().run(true, true, op);
		} catch (InterruptedException e) {
			return false;
		} catch (InvocationTargetException e) {
			
			Throwable t = e.getTargetException();
			String message = DataTransferMessages.WizardExternalProjectImportPage_errorMessage;
			IStatus status;
			if (t instanceof CoreException)
				status = ((CoreException)t).getStatus();
			else
				status = new Status(IStatus.ERROR, IDEWorkbenchPlugin.IDE_WORKBENCH, 1, message, t);
			ErrorDialog.openError(getShell(), 
				message,
				null,
				status);
			return false;