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3 posts

2026-11-04 csharp dotnet performance

When is Stopwatch not high resolution in .NET, and what do IsHighResolution and Frequency report on each OS?

On .NET Core and .NET 5+ Stopwatch.IsHighResolution is a hard-coded true and never false. Frequency is whatever QueryPerformanceFrequency says on Windows (usually 10 MHz) and a fixed 1,000,000,000 on Linux, macOS, iOS, Android and WASM, which is a unit, not a resolution. Only .NET Framework can fall back to DateTime. Source walkthrough plus a measured run on .NET 10 / Apple M4 showing 1 ns nominal ticks but 41.67 ns real steps.

2026-07-27 csharp dotnet dotnet-11

How to diagnose a managed memory leak with dotnet-gcdump and dotnet-dump

A complete workflow for finding a managed memory leak in .NET 11: confirm growth with dotnet-counters, take two gcdumps and diff them, then collect a dump and use dumpheap, gcroot, and objsize in dotnet-dump analyze to find what is still holding the reference.

2026-04-25 dotnet dotnet-11 performance

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.