How to improve performance in a .NET application?

Question

Hello everyone,

I am working on a .NET application and recently noticed that the system performance becomes slower when handling a large amount of data and multiple user requests at the same time.

I would like to know what are the best practices to optimize a .NET application, including database performance, code optimization, memory management, and improving response time.

If anyone has experience with performance tuning in .NET projects, please share your suggestions, tools, or practical solutions.

Thank you for your help!

Cynthia Sathuragiri · Answer

Performance issues in .NET applications under heavy load are often caused by inefficient database queries, unnecessary data retrieval, memory allocations, or synchronous operations. The first step is to identify the bottleneck using profiling tools like Visual Studio Performance Profiler, Application Insights, or MiniProfiler instead of optimizing blindly. A few practices that have worked well for me are: Optimize SQL queries and add proper indexes. Use AsNoTracking() for read-only queries in EF Core. Retrieve only the required columns instead of entire entities. Avoid N+1 queries by using Include() or projections where appropriate. Use async/await throughout the request pipeline to improve scalability. Implement caching (MemoryCache or Redis) for frequently accessed data. Batch database operations instead of calling SaveChanges() repeatedly. Enable pagination for large datasets instead of loading everything into memory. Monitor CPU, memory, and slow SQL queries regularly to catch performance issues early. Finally, always validate improvements with load testing tools like k6, JMeter, or NBomber. Measuring before and after each change helps ensure the optimization actually improves performance.

Jignesh Kumar · Answer

one of the part is SQL Query optimization : SQL : Enhance SQL Server Stored Procedure Performance – Tuning Tips .Net : https://www.c-sharpcorner.com/UploadFile/dacca2/improve-performance-of-net-application/ API : https://www.c-sharpcorner.com/blogs/improving-api-performance-in-net-core

Andrew beb · Answer

I would also appreciate any recommendations for useful resources, documentation, Chill Guy Clicker, or real-world examples that can help me better understand and apply these improvements.

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