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copied!<p>I think you should read <a href="http://community.jboss.org/wiki/Hibernate3MigrationGuides" rel="nofollow">Hibernate3 Migration Guides</a> from 3.0 step by step up to 3.6 Hibernate </p> <p>And here is the quick search in the <a href="https://github.com/hibernate/hibernate-core/blob/3.6/changelog.txt" rel="nofollow">hibernate changelog</a> about the improvement and path on the performance from 3.0 to 3.6</p> <ul> <li>[HHH-5823] - Poor multithread performance in UpdateTimestampsCache class</li> <li>[HHH-5824] - Poor multithread performance in SessionFactoryImpl.getQueryCache method</li> <li>[HHH-3860] - Cascading performance problems when session contains many entities</li> <li>[HHH-3357] - improve performance of session.clear()</li> <li>[HHH-2553] - New LoadContexts Implementation causing possible performance degradation</li> <li>[HHH-2957] - ActionQueue Insertion sort performance degrades exponentially (Jay Erb)</li> <li>[HHH-2553] - New LoadContexts Implementation causing possible performance degradation</li> <li>[HHH-2229] - Performance issue with fix for HHH-1293, CGLIBLazyInitializer may be slower for certain Java classes</li> <li>[HHH-2023] - performance optimization of JTATransactionFactory.isTransactionInProgress()</li> <li>[HHH-864] - Use QUERY_CACHE for sessions with filters to improve performance</li> <li>[HHH-525] - cglib related startup performance</li> </ul> <p>You can search in the <a href="https://hibernate.onjira.com/browse/HHH" rel="nofollow">Hibernate JIRA</a> for each item 's details.Good luck</p>

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