Vlad Mihalcea is a Hibernate Developer Advocate. He spoke at Devoxx France, Voxxed Days Bucharest, JavaZone. This is a list of presentations that he’s been giving in 2016: https://vladmihalcea.com/presentations/
Hibernate is the most popular JPA provider and knowing its inner-workings can make the difference between a high-performance enterprise application and one that barely crawls. This presentation goes through the most common performance bottlenecks issues like exotic mappings, too much flushing, inappropriate queries, JDBC batch updates misuse, and suboptimal result set fetching. Aside from common anti-patterns, I will also present some very useful Hibernate features like the enhanced identifier generators, caching strategies, and bytecode enhancements.