ASP.NET Core Performance

Introduction

ASP.NET Core is built for high performance. This tutorial covers techniques, tools, and best practices to help you write faster, more scalable applications.

Key Performance Areas

• Request throughput – How many requests per second your app can handle.
• Latency – Time to process a single request.
• Memory usage – Efficient allocation and disposal.
• CPU utilization – Reducing wasteful cycles.

Sample Code: Optimizing a Controller

using Microsoft.AspNetCore.Mvc;

[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
{
    private static readonly WeatherForecast[] _forecasts = GenerateForecasts();

    [HttpGet]
    public IEnumerable<WeatherForecast> Get()
    {
        // No async/await overhead for CPU‑bound work
        return _forecasts;
    }

    private static WeatherForecast[] GenerateForecasts()
    {
        var rng = new Random();
        return Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = DateTime.Now.AddDays(index),
            TemperatureC = rng.Next(-20, 55),
            Summary = Summaries[rng.Next(Summaries.Length)]
        }).ToArray();
    }

    private static readonly string[] Summaries = new[]
    {
        "Freezing", "Bracing", "Chilly", "Cool", "Mild",
        "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    };
}

Interactive Throughput Calculator

Further Reading

• Microsoft Performance Best Practices
• dotnet/performance GitHub repo