General Performance Tip: Performance Impact of Sealing Attributes

Mar 21, 2024 11:42 AM

When crafting custom attributes, Microsoft advises sealing them to enhance performance. In my coding standards manual, I advocate sealing any class not intended for inheritance, primarily to convey the class’s intent. However, do sealing attributes actually result in improved performance?

Benchmark Results

These benchmark tests demonstrate that the performance difference between sealing and not sealing attributes is negligible, with both options resulting in a memory allocation of 24 bytes.

I maintain my recommendation: any class not intended for inheritance should be sealed for robust class design.

This is how I have it setup checking for this issue in my EditorConfig: dotnet_diagnostic.CA1813.severity = suggestion

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