This summary provides an overview of the article "Building a Blazing Fast Object-to-Object Mapper in C# with .NET Core 3.1" by Gunnar Peipman. The author presents four different approaches to creating an object-to-object mapper: Unoptimized, Optimized, Dynamic code generation, and Lightweight Code Generation (LGC). Each approach is more complex than the previous one, and they are compared in terms of performance using benchmarking tests. The article also discusses the importance of choosing the right approach based on the specific requirements of the project. Additionally, it highlights the changes in the .NET Core framework over time and how these changes have impacted the performance of different object mapping techniques.