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memory

6 posts

2026-10-27 csharp dotnet performance

How to iterate over two collections in lockstep without heap allocations in C#

Enumerable.Zip allocates 144-208 bytes per call and runs about 10x slower than a plain loop. For arrays and lists, a for loop over two spans sliced to the same length is allocation-free and the fastest option; for foreach syntax, a small ref struct zip enumerator gets within 25% of it. Measured on .NET 10.0.10 and .NET 11 RC 3.

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.

2026-06-20 csharp dotnet performance

What is Span<T> in C#, and when does it actually make your code faster?

Span<T> can avoid temporary copies and allocations when parsing or formatting contiguous memory. Learn what it owns, lifetime limits and what to measure.

2026-06-01 flutter dart memory

How to Dispose Controllers in Flutter to Avoid Memory Leaks

AnimationController, TextEditingController, and ScrollController hold resources that Dart's GC cannot reclaim until you dispose them. Here is the correct pattern, the ordering rules, and how to catch leaks before they ship.

2026-05-25 comparison csharp dotnet

List<T> vs Span<T> vs ReadOnlySpan<T> in C#: when to reach for which

Choose List<T> for a growable collection, Span<T> for a mutable view, and ReadOnlySpan<T> for reading contiguous memory. Understand lifetime and async limits.

2026-05-04 csharp dotnet performance

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.