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Having too many or slow database queries can slow down your application’s response time, which in turn impacts the user experience. Slow response times can cause your users to quit using your application. Therefore you should always test your application’s response time during development, in addition to functional testing.

Sniffy helps you to identify anti-patterns like the N+1 Query Problem by listing all executed SQL queries of a Java web application directly in your browser.

Sniffy - interactive profiler, testing and chaos engineering tool for Java