LINQ's INSANE Improvements in .NET 9

Summary

.NET 9 demonstrates significant performance improvements in LINQ operations, achieving up to 1,800x speedups in some use cases. This advancements come from Microsoft's dedicated efforts to optimize LINQ, making it competitive with or even surpassing handwritten code. Developers can now leverage these optimizations in .NET 9 for substantially faster code execution, particularly with common LINQ methods like `ToList`, `Any`, `All`, `Count`, `First`, and `Single`.