Which part of the project causes the biggest bottlenecks or performance issues?

The biggest bottlenecks in performance are often related to:

• Slow database queries, especially when there are no indexes or when using complex JOINs.
• Improper use of threads and synchronization, leading to deadlocks.
• Suboptimal memory management, such as leaks or excessive object creation.
• Network delays when interacting with external services.

To identify such bottlenecks, profiling and monitoring tools are usually used (e.g., Java Flight Recorder, VisualVM). Optimization may include caching, query refactoring, asynchronous processing, and component scaling.