The author details extensive performance benchmarking of .NET 8, showcasing its notable improvements but also highlighting areas of performance regression compared to .NET 6. The areas of regression include slows in object creation, disposing, checking for null, array creation, LINQ methods, string handling, string compression, finding strings, encoding and decoding, and certain LINQ APIs and Lambda methods. He encourages developers to benchmark their code before transitioning to .NET 8.
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