In what situations can performance issues arise when using Hibernate?

Performance issues when using Hibernate can arise in the following situations:

• N+1 queries: when for each record of the main selection, an additional query is executed for related entities. This leads to many small database queries.
• Eager fetching: loading too many related data that are not needed in the current context increases data transfer and processing time.
• Lack of indexes in the database: Hibernate generates SQL queries, but if the database lacks necessary indexes, queries will be slow.
• Large transactions and sessions: if the Hibernate session holds many objects, it increases memory consumption and slows down.
• Use of inefficient queries or incorrect caching strategies.

To improve performance, analyze generated queries, use eager and lazy loading consciously, apply caching, and optimize database structure.