type-design-performance

What problem does it solve?

This skill helps developers design and review .NET types for performance, guiding them to apply proven patterns that minimize allocations and improve runtime efficiency.

Core Features & Use Cases

• Sealing by default: mark types as non-inheritable to enable JIT devirtualization and clearer API intent.
• Readonly structs for immutability: use readonly value types to avoid defensive copies.
• Static pure functions: prefer stateless helpers to improve testability and performance.
• Defer enumeration: avoid early materialization and reduce allocations.
• Immutable return types: expose APIs with IReadOnlyCollection<T> or immutable wrappers to prevent unintended mutations.

Quick Start

Start by auditing a type design in your project and propose performance-oriented improvements for the API surface.