.NET performance issues can degrade your application’s responsiveness and user experience. Let’s dive into 10 common pitfalls and practical ways to avoid them:

1. Excessive database calls: Use caching or batching techniques.
2. Large object allocations: Prefer object pooling or use structs where suitable.
3. Not disposing IDisposable objects: Always dispose objects properly with ‘using’ statements.
4. Ignoring asynchronous programming: Embrace async/await to prevent thread starvation.
5. Using inefficient LINQ queries: Optimize or replace them with direct loops when necessary.
6. Unnecessary boxing/unboxing: Use generics and value types correctly.
7. Poor exception handling: Handle exceptions carefully without excessive logging.
8. Improper String handling: Use StringBuilder for string manipulations in loops.
9. Missing database indexes: Regularly check and optimize your database indexes.
10. Ignoring profiling tools: Regularly profile your apps using Visual Studio tools.

Apply these tips proactively for noticeable performance improvements.