He pointed out that, while pretty much the entire code base could be improved, the vast majority of this effort would not matter in the least. In fact, it would not even be enough to be perceived by the user. However, there were a few spots where almost all the time was going, and if we could improve those few areas, we could make a real impact. So that's where we needed to focus. He pointed out that in most organizations, they tell everyone that “performance is important,” and so every team works a little on performance. But the vast majority of that work makes absolutely no difference. And,
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