General Performance: Performance Impact of Sealing Attributes

Microsoft historically recommended sealing attributes for potential performance benefits. In my coding standards book, I advocate sealing any class not intended for inheritance, primarily to communicate the class’s intent and uphold proper OOP design principles. However, benchmarks show that sealing attributes does not provide a meaningful performance advantage.

Performance Breakdown

These benchmark results demonstrate that the non-sealed Attribute is slightly faster.

When I set up my EditorConfig to check for this issue, it looks like this:
dotnet_diagnostic.CA1813.severity = suggestion

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

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