Bug 27264 opening/closing java files in presence of hiearchical package explorer is slow
will attach profiles
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageFragmentProvider.java
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 * Copyright (c) 2000, 2002 International Business Machines Corp. and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v0.5 
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 * Contributors:
 *     IBM Corporation - initial API and implementation
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package org.eclipse.jdt.internal.ui.packageview;
import java.util.ArrayList;
import java.util.List;