How I Reduced My Blazor App’s Load Time by 80% with These Simple Tricks

As a senior .NET developer, I’ve always been excited about Blazor’s potential to revolutionize web development. However, like many of you, I’ve also grappled with its performance challenges, particularly when it comes to initial load times. In this article, I’ll share the journey of how I optimized a complex Blazor WebAssembly application, reducing its load time from a sluggish 10 seconds to a snappy 2 seconds. Let’s dive into the tricks that made this possible.

TL;DR:

By optimizing the WebAssembly payload, implementing efficient lazy loading, using virtualization, refining state management, and optimizing network requests, we reduced our Blazor app’s load time from 10 seconds to 2 seconds — an 80% improvement.

The Initial Problem

Our application was a data-heavy dashboard for a financial services company. It included real-time data visualization, complex calculations, and a rich user interface. The initial load time was painfully slow:

• First Contentful Paint (FCP): 3.5 seconds
• Time to Interactive (TTI): 10.2 seconds
• Total Blazor WebAssembly payload: 8.2 MB

Initial Performance Metrics
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