Don Syme has been working on struct tuples for F# language. Let's see if they are more performant than "old" (heap allocated) tuples in simple scenario: returning tuple from function. The code is very simple: Decompiled code in Release configuration: Everything we need to change to switch to struct tuples, is adding "struct" keyword in front of constructor and pattern matching: Decompiled code in Release configuration: I don't know about you, but I was surprised with those results. The performance roughly[...]