dotnet-performance-patterns

Reduce memory allocations in .NET by using Span<T> and Memory<T> for zero-allocation coding, ArrayPool<T> for buffer pooling, and readonly struct or ref struct for efficient data design. This decreases garbage collection pressure and increases application throughput.

The best way to parse strings without allocating memory is using ReadOnlySpan<char> slicing instead of Substring calls. This high-throughput parsing technique avoids memory copies and significantly reduces garbage collection impact in .NET.

ArrayPool<T> works by renting and returning shared array buffers, significantly reducing the overhead of frequent large object allocations. This pooling mechanism minimizes garbage collection pressure and improves overall .NET application performance.

Use ref struct for stack-only types like Span<T> to prevent heap allocation, and readonly struct to eliminate defensive copies. Both struct optimization techniques improve .NET performance by reducing memory overhead and avoiding unnecessary allocations.

JIT devirtualization for sealed classes improves .NET 8.0 performance by enabling the compiler to inline method calls and remove virtual method dispatch overhead. Sealing classes allows the JIT compiler to optimize throughput significantly.

You can use stackalloc for stack-based memory allocation to completely avoid garbage collection overhead. This .NET feature allocates small memory blocks on the stack, automatically freeing memory when the method returns, enhancing performance.