Totally! Java is in a class of languages that encourages a high allocation rate. I think that each language has a kind of "average" allocation rate that is an

Totally! Java is in a class of languages that encourages a high allocation rate. I think that each language has a kind of "average" allocation rate that is an indirect outcome of the various design decisions in the language. I think you're right that C# probably has a lower average allocation rate because of structs. It's true that languages with lower average allocation rates benefit less from compaction, because they benefit less from any GC optimization.