How much overhead does a framework like Hibernate make?

Question

Developers sometimes encounter Enterprise multi-tier web applications ... Enterprise is seen by some as synonymous with slow, bloated, and resource-intensive applications.

Do environments such as Hibernate have a non-trivial performance impact compared to writing your own DAOs or other less abstract approaches? In a non-trivial way, I believe the question is "what is the user loading pages more slowly lately".

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