Question 1

How do I set up Fusion with Blazor WebAssembly?

Accepted Answer

Add the ActualLab.Fusion NuGet package, implement IComputeService with [ComputeMethod]-tagged virtual methods, and register services using AddFusion(). The samples provide step-by-step guidance for both Server and WebAssembly hosting modes.

Question 2

Fusion vs SignalR: which is better for real-time apps?

Accepted Answer

Fusion includes built-in real-time updates via cache invalidation and is faster, but SignalR is more established and works with any frontend. Fusion is ideal for .NET/Blazor apps needing automatic state sync, while SignalR suits cross-platform or simpler real-time needs.

Question 3

Does Fusion work with Entity Framework Core?

Accepted Answer

Yes, but you must handle invalidation manually in write methods using Invalidation.Begin(), similar to the file I/O example. Fusion can cache EF query results, but updates require explicit invalidation to maintain consistency.

Question 4

What are the performance costs of using Fusion?

Accepted Answer

Fusion adds overhead for method interception and dependency tracking, but benchmarks show massive speedups (up to 8,000x) due to caching. Performance degrades only if dependency graphs become overly complex or invalidation is misconfigured.

Question 5

How does Fusion handle offline data sync?

Accepted Answer

It integrates client-side persistent cache with IndexedDB or SQLite, allowing apps to work offline and sync automatically when online. The RPC client batches calls and uses speculative execution to minimize network chattiness.

Question 6

Is Fusion suitable for microservices architectures?

Accepted Answer

Fusion excels in monolithic or tightly-coupled .NET apps but may be less ideal for microservices due to its deep state synchronization across clients and servers, which can introduce coupling. ActualLab.Rpc can be used independently for fast RPC.

Question 7

What are common mistakes when implementing Fusion?

Accepted Answer

Forgetting to mark methods as virtual or use [ComputeMethod], incorrect invalidation scopes leading to stale data, and not optimizing dependency chains for performance. The documentation emphasizes testing invalidation logic thoroughly.

ActualLab.Fusion

What is ActualLab.Fusion?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions