The Secrets of Consulting", Gerald Weinberg advise against improving more than 10% of performance, and if so, of hoping to have any credit.
Just like the article, his reasoning is that if you improve performance too much, it makes management/the team look bad for not doing it before, while a smaller improvement in performance make management looks good.
This was a fat-finger mistake. I copied the comment for my notes and somehow fired off a cmd-v while in the comment window. My apologies. This was not the intent.