Its nice being able to go all the way from fully GC reliant cyclic data-types with closures all the way to memory control-freak every byte and microsecond matte

Its nice being able to go all the way from fully GC reliant cyclic data-types with closures all the way to memory control-freak every byte and microsecond matters by using stack objects and 'var' parameters. Often you can keep 90% of the code and just tweak a few slow points.