Copilot Studio's .NET 10 WebAssembly upgrade: 20% cold path, 5% warm
Microsoft moved Copilot Studio's WASM engine from .NET 8 to .NET 10. The dual JIT/AOT package, fingerprinting, and WasmStripILAfterAOT explain the numbers.
Tag: performance
27 posts · Page 1 of 3
How to profile jank in a Flutter app with DevTools
Step-by-step guide to finding and fixing jank in Flutter 3.27 with DevTools: profile mode, the Performance overlay, the Frame Analysis tab, the CPU Profiler, raster vs UI thread, shader warm-up, and Impeller-specific gotchas. Tested on Flutter 3.27.1, Dart 3.11, DevTools 2.40.
How to write a Dart isolate for CPU-bound work
When async/await is not enough: spawn a Dart isolate to run CPU-bound work off the UI thread. Isolate.run, Flutter's compute, long-lived workers with SendPort/ReceivePort, what can cross the boundary, and the JS/web caveat. Tested on Dart 3.11 and Flutter 3.27.1.
How to convert T[] to ReadOnlyMemory<T> in C# (implicit operator and explicit constructor)
Three ways to wrap a T[] in a ReadOnlyMemory<T> in .NET 11: the implicit conversion, the explicit constructor, and AsMemory(). When each is the right call.
How to detect N+1 queries in EF Core 11
A practical guide to spotting N+1 queries in EF Core 11: what the pattern looks like in real code, how to surface it via logging, diagnostic interceptors, OpenTelemetry, and a test that fails the build when a hot path regresses.
How to use compiled queries with EF Core for hot paths
A practical guide to EF Core 11 compiled queries: when EF.CompileAsyncQuery actually wins, the static-field pattern, the Include and tracking gotchas, and how to benchmark before and after so you can prove it was worth the extra ceremony.
How to use SearchValues<T> correctly in .NET 11
SearchValues<T> beats IndexOfAny by 5x to 250x but only when you use it the way the runtime expects. The cache-as-static rule, the StringComparison gotcha, when not to bother, and the IndexOfAnyExcept inversion trick that nobody documents.
How to reduce cold-start time for a .NET 11 AWS Lambda
A practical, version-specific playbook for cutting .NET 11 Lambda cold starts. Covers Native AOT on provided.al2023, ReadyToRun, SnapStart on the managed dotnet10 runtime, memory tuning, static reuse, trim safety, and how to actually read INIT_DURATION.
How to warm up EF Core's model before the first query
EF Core builds its conceptual model lazily on the first DbContext access, which is why the first query in a fresh process is several hundred milliseconds slower than every query after it. This guide covers the three real fixes in EF Core 11: a startup IHostedService that touches Model and opens a connection, dotnet ef dbcontext optimize to ship a precompiled model, and the cache-key footguns that silently rebuild the model anyway.
How to profile a .NET app with dotnet-trace and read the output
A complete guide to profiling .NET 11 apps with dotnet-trace: install, pick the right profile, capture from startup, and read the .nettrace output in PerfView, Visual Studio, Speedscope, or Perfetto.