10 Tips to Increase Your ASP.NET Core Website Performance

Performance is very important; it is a major factor for the success of any web application. ASP.NET Core 3.0 includes several enhancements that scale back memory usage and improve turnout. The following is 10 tips to increase your ASP.NET Core performance:

1. Avoid synchronous and use asynchronous

Try to avoid synchronous calling when developing ASP.NET Core 3.0 applications. Synchronous calling blocks the next execution until the current execution is completed. While fetching data from an API or performing operations like I/O operations or independent calling, execute the call in an asynchronous manner.

Avoid using Task.Wait and Task.Result, and try to use await. The following code shows how to do this.

public class WebHost
    public virtual async Task StartAsync(CancellationToken cancellationToken = default)
        // Fire IHostedService.Start
        await _hostedServiceExecutor.StartAsync(cancellationToken).ConfigureAwait(false);
        // More setup
        await Server.StartAsync(hostingApp, cancellationToken).ConfigureAwait(false);
        // Fire IApplicationLifetime.Started
        // Remaining setup
Entity Framework 3.0 Core also provides a set of async extension methods, similar to LINQ methods, that execute a query and return results.

2. Asynchronous saving

Asynchronous saving avoids a thread block while changes are written to the database. It provides DbContext.SaveChangesAsync() as an asynchronous alternative to DbContext.SaveChanges().

public static async Task AddBlogAsync(string url)
    using (var context = new BloggingContext())
        var blogContent = new BlogContent { Url = url };
        await context.SaveChangesAsync();

3. Use caching technology

Increase the performance of an application by reducing the number of requests to the server. Avoid calling the server every time and cache the data instead. Store the response for the future, and use it the next time you make a call for the same response.

These are some caching techniques:

  • In-memory caching.
  • Distributed cache.
  • Cache tag helper.
  • Distributed cache tag helper.

4. Asynchronous querying

Asynchronous queries avoid blocking a thread while the query is executed in the database. Async queries are important for quick, responsive client applications.


  • ToListAsync()
  • ToArrayAsync()
  • SingleAsync()
public async Task<List> GetBlogsAsync()
    using (var context = new BloggingContext())
        return await context.Blogs.ToListAsync();

5. Use JSON serialization

ASP.NET Core 3.0 uses System.Text.Json for JSON serialization by default. Now, you can read and write JSON asynchronously. This improves performance better than Newtonsoft.Json. The System.Text.Json namespace provides the following features for processing JSON:

  • High performance.
  • Low allocation.
  • Standards-compliant capabilities.
  • Serializing objects to JSON text and deserializing JSON text to objects.

6. Use response compression

Response compression, which compresses the size of a file, is another factor in improving performance. In ASP.NET Core, response compression is available as a middleware component.

Usually, responses are not natively compressed. This typically includes CSS, JavaScript, HTML, XML, and JSON.

  • Don’t compress natively compressed assets, such as PNG files.
  • Don’t compress files smaller than about 150-1000 bytes

The following sample code shows how to enable Response Compression Middleware for the default MIME types and compression providers.

public class Startup
    public void ConfigureServices(IServiceCollection services)
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)

These are the providers:

public void ConfigureServices(IServiceCollection services)
    services.AddResponseCompression(options =>
        options.MimeTypes =
                new[] { "image/svg+xml" });

7. HttpContext accessibility improvements

HttpContext accessibility is only valid as long as there is an active HTTP request in ASP.NET Core. Here are some suggestions for accessing HttpContext from Microsoft’s documentation:

8. Reduce HTTP requests

Reducing the number of HTTP requests is one of the major optimizations. Cache the webpages and avoid client-side redirects to reduce the number of connections made to the web server.

Use the following techniques to reduce the HTTP requests:

  1. Use minification.
  2. Use bundling.
  3. Use sprite images.

By reducing HTTP requests, these techniques help pages load faster.

9. Use exceptions only when necessary

Exceptions should be rare. Throwing and catching exceptions will consume more time relative to other code flow patterns.

  • Don’t throw and catch exceptions in normal program flow.
  • Use exceptions only when they are needed.

10. Client-side improvements

Client-side optimization is one important aspect of improving performance. When creating a website using ASP.Net Core, consider the following tips:


Bundling combines multiple files into a single file, reducing the number of server requests. You can use multiple individual bundles in a webpage.


Minification removes unnecessary characters from code without changing any functionality, also reducing file size. After applying minification, variable names are shortened to one character and comments and unnecessary whitespace are removed.

Loading JavaScript at last

Load JavaScript files at the end. If you do that, static content will show faster, so users won’t have to wait to see the content.

Use a content delivery network

Use a content delivery network (CDN) to load static files such as images, JS, CSS, etc. This keeps your data close to your consumers, serving it from the nearest local server.


Hope that tips above can help you to improve your ASP.NET Core 3.0 performance. If you have other feedback, please kindly let us know. Thank you!

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