This particular one is. Maybe we could measure time-to-warmup or hot performance and with extremely careful scientific process we can say X application has sped up by Y percent. It also would not be helpful, because we know that it's a micro-improvement. Having data on the results of this improvement in the context of compilation speed and machine code output is useful, since it tells us that it's not a micro-un-improvement and because that was the intermediary goal in this optimization.