Deep Dive Blog Posts

List of blog posts that provide a 'deep-dive' into the CoreCLR source code

Posts that take a high-level overview of releases

• Corestart 2.0: What's new for performance in .NET Core 2.0
• Performance Improvements in .NET Core 2.0
• Performance Improvements in .NET Core 2.1
• Performance Improvements in .NET Core 3.0
• Performance Improvements in .NET 5
• Performance Improvements in .NET 6
• Performance Improvements in .NET 7
• Performance Improvements in .NET 8
• Performance Improvements in .NET 9
• Performance Improvements in .NET 10

Posts that take a high-level look at the entire source:

• A Hitchhikers Guide to the CoreCLR Source Code
• The 68 things the CLR does before executing a single line of your code
• Research papers in the .NET source

Posts that reference specific parts of the source:

• A look at the internals of 'boxing' in the CLR
• Memory Usage Inside the CLR
• How the .NET Runtime loads a Type
• Adding a new Bytecode Instruction to the CLR
• Arrays and the CLR - a Very Special Relationship
• The CLR Thread Pool 'Thread Injection' Algorithm
• The .NET IL Interpreter
• How do .NET delegates work?
• Why is reflection slow?
• Preventing .NET Garbage Collections with the TryStartNoGCRegion API
• GC Pauses and Safe Points
• Strings and the CLR - a Special Relationship
• How Async/Await Really Works in C#