Laszlo

Hello, I am Laszlo

Software-Engineer, .NET developer

Contact Me

Deep dive into .NET 11 Performance Improvements #3

11/06/2026

In this series, I explore some of the most interesting .NET 11 performance improvements described in Stephen Toub's blog post, Performance Improvements in .NET 11.

Each of my post focuses on one example from the original article while digging a little deeper into an additional aspect that was not covered there. The series covers the following topics:

  1. Allocation free numbers
  2. Virtual generic method calls
  3. Current post: Vector zero equality
  4. Guid creation on Linux
  5. JIT generating implicit-else assembly instructions
  6. Guid equality
  7. Copy-on-write locking strategy

Vector zero equality

Find out more »

Deep dive into .NET 11 Performance Improvements #2

11/05/2026

In this series of posts, I am going to explore some of the most interesting .NET 11 performance improvements I learned about in Stephen Toub's blog post, Performance Improvements in .NET 11.

Each of my post focuses on one example from the original article, but digs a little deeper into one additional aspect that was not covered there. The series covers the following topics:

  1. Allocation free numbers
  2. Current post: Virtual generic method calls
  3. Vector zero equality
  4. Guid creation on Linux
  5. JIT generating implicit-else assembly instructions
  6. Guid equality
  7. Copy-on-write locking strategy

Virtual generic method calls

Find out more »

Deep dive into .NET 11 Performance Improvements

11/04/2026

In this series of posts, I am going to explore some of the most interesting .NET 11 performance improvements I learned about in Stephen Toub's blog post, Performance Improvements in .NET 11.

Each of my post focuses on one example from the original article, but digs a little deeper into one additional aspect that was not covered there. The series covers the following topics:

  1. Current post: Allocation free numbers
  2. Virtual generic method calls
  3. Vector zero equality
  4. Guid creation on Linux
  5. JIT generating implicit-else assembly instructions
  6. Guid equality
  7. Copy-on-write locking strategy

Allocation free numbers

Find out more »

Cancellation and Application Shutdown in an HTTP Server

11/02/2026

I work on a personal project to build an ASP.NET Core server to serves HTTP/2 and HTTP/3 request-response pairs. This server integrates with ASP.NET Core applications, providing an alternative to Kestrel, IIS, HTTP.sys, and similar servers.

In most codebases I've encountered, significant effort goes into optimizing the startup process—starting the host, registering types, initializing background services, and establishing downstream connections. The goal is usually to achieve the fastest and most efficient application initialization. However, it's much less common for applications to pay the same attention to the shutdown process. That’s the focus of this post.

For server applications, there's often an assumption that requests are retriable. If a request is interrupted due to application shutdown, the client can simply retry. However, HTTP only guarantees safe retries for idempotent verbs and compliant servers.

At the infrastructure level, sophisticated hosting solutions can drain all active HTTP connections before terminating the server process. In a less controlled environments, a process might be terminated abruptly, without draining connections or even sending a SIGINT (CTRL+C) or SIGTERM signal.

Find out more »

Prefixed Integer Encoding with SIMD

10/21/2026

HTTP/3 uses QPACK to encode header fields. QPACK uses the prefixed integer encoding from RFC 7541.

In a previous post I explored this encoding and compared it with QUIC's Variable Length Integer Encoding. That comparison considered using SIMD for prefixed-integer decoding.

This post explores encoding prefixed integers using SIMD.

Prefixed Integer Encoding

Find out more »