The online whiteboard of Kristofer Palmvik
SSE in .NET 10 is the perfect middle ground for simple, one-way updates like dashboards, notification bells, and progress bars. It's lightweight, HTTP-native, and easy to secure using your existing middleware. However, SignalR remains the robust, battle-tested choice for complex bi-directional communication or massive scale requiring a backplane.
ASP.NET Core has traditionally offered two caching options: in-memory caching and distributed caching. Each has its trade-offs. In-memory caching using IMemoryCache is fast but limited to a single server. Distributed caching with IDistributedCache works across multiple servers using a backplane. .NET 9 introduces HybridCache, a new library that combines the best of both approaches. It prevents common caching problems like cache stampede. It also adds useful features like tag-based invalidation and better performance monitoring.