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How do I improve rendering performance by virtualizing a Blazor component?

Platform: Blazor| Category : Tips and Tricks, General

Blazor virtualization is a technique for limiting UI rendering to just the parts that are currently visible. It improves the perceived performance of component rendering using the Blazor framework’s built-in virtualization support with the virtualize component. When you are using a long list-item component with a loop, you can use virtualization for better performance.

Use the Virtualize component when:

  • A set of data items in a loop needs to be rendered.
  • Many items can’t be seen when scrolling.
  • Items to be rendered are equal in size.


  • .NET 5.0 and above.
  • Visual Studio 2019 Preview 3 (v16.8) or greater.

Follow the below example to achieve this.


@page "/"

<Virtualize Items="employees" Context="employee">

@code {

    private List<Employee> employees;

    protected override async Task OnInitializedAsync()
        employees = await EmployeeDetails();

    private async Task<List<Employee>> EmployeeDetails()
        List<Employee> empList = new List<Employee>();

        for (int i = 1; i <= 30; i++)
            var emp = new Employee()
                EmployeeId = $"EmpID - {i}",
                Salary = $"Salary - {i * 100}",

        return await Task.FromResult(empList);

    public class Employee
        public string EmployeeId { get; set; }
        public string Salary { get; set; }

Refer to “ASP.NET Core Blazor component virtualization” for more details.

View Sample in GitHub

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