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While I understand that sealed can be used for security reasons, a few people use the sealed keyword on leaf nodes as an optimization technique.
How does this help optimization? Why isn’t the compiler smart enough to figure this out itself?
In a sealed class, calls to virtual methods can bypass the usual virtual method lookup and go directly to the most-derived virtual method implementation instead. In principle, the compiler/JIT could also inline these calls.
The compiler can’t figure it out for non-sealed classes, because any code could come along after compilation and inherit from your class: the compiler must assume the worst case.