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> static lambdas are emitted as instance methods on a singleton receiver
> delegates invoke dispatch is optimized for instance delegates so it is preferrable to emit lambdas as instance methods even when lambdas do not capture anything
https://github.com/dotnet/roslyn/commit/3de67f36894b8c93431619c256d77cc9cd2e291a?diff=unified#diff-b90f2a5538ff89f48e9be8fb116822baR988

ということで、どうもデリゲート自体が thiscall のほうが速いっぽいぞ