ASP.NET Core 8 and .NET 8 bring many exciting performance improvements. In this blog post, we will highlight some of the enhancements made in ASP.NET Core and show you how they can boost your web app’s speed and efficiency. This is a continuation of last year’s post on Performance improvements in ASP.NET Core 7. And, of course, it continues to be inspired by Performance Improvements in .NET 8. Many of those improvements either indirectly or directly improve the performance of ASP.NET Core as well. We will use BenchmarkDotNet for many of the examples in this blog post. To setup a benchmarking project: Create a new console app (dotnet new console) Add a Nuget reference to BenchmarkDotnet (dotnet add package BenchmarkDotnet) version 0.13.8+ Change Program.cs to var summary = BenchmarkSwitcher.FromAssembly(typeof(Program).Assembly).Run(); Add the benchmarking code snippet below that you want to run Run dotnet run -c Release and enter the number of the benchmark you want to run when prompted Some of the benchmarks test internal types, and a self-contained benchmark cannot be written. In those cases we’ll either reference numbers that are gotten by running the benchmarks in the repository (and link to the code in the repository), or we’ll provide a simplified example to showcase what the improvement is doing. There are also some cases where we will reference our end-to-end benchmarks which are public at https://aka.ms/aspnet/benchmarks. Although we only display the last few months of data so that the page will load in a reasonable amount of time. Servers We have 3 server implementations in ASP.NET Core; Kestrel, Http.Sys, and IIS. The latter two are only usable on Windows and share a lot of code. Server performance is extremely important because it’s what processes incoming requests and forwards them to your application code. The faster we can process a request, the faster you can start running application code. Kestrel Header parsing is one of the first parts of processing done by a server for every request. Which mea
