Performance Bug

Performance bugs manifest as slow page loads, delayed responses to user actions, high memory usage, excessive network requests, or animations that stutter. The application works, but it works slowly enough to frustrate users. Research consistently shows that users abandon applications that take more than a few seconds to respond.

AI-generated code is often inefficient in ways that are not immediately apparent. The AI might generate a database query that scans every row in a table instead of using an index, load an entire dataset into memory instead of paginating, or render complex components unnecessarily on every state change. These issues may not surface during development with small amounts of test data but become severe with real usage.

Performance bugs are often discovered by human testers who notice that an action takes too long or that the interface feels sluggish. While automated performance monitoring tools can track metrics, a human tester can relate performance observations to their impact on the actual user experience, providing more actionable feedback.