Interesting, thank you. But I think those points are not correlated that much. For example if I create unnecessary wrappers in a loop, I might double the alloca

Interesting, thank you. But I think those points are not correlated that much. For example if I create unnecessary wrappers in a loop, I might double the allocation rate, but I will not halve the live heap size, because I did not have those wrappers outside the loop before. Basically, I'm trying to come up with an real world example of a style change (like create wrappers for every error, or use naked integers instead of time.Time) to estimate its impact. And my feeling is that any such example would affect one of your points way more than the other, so we can still argument that e.g. "creating short-lived iterators is totally fine".