> Bad memory layouts are one of the biggest contributors to poor performance. This will depend on the application, but I've encountered far more of the "wrong

> Bad memory layouts are one of the biggest contributors to poor performance. This will depend on the application, but I've encountered far more of the "wrong data structure / algorithm" kind of problem, like iterating over a list to check if something's in there when you could just make a map ("we need ordering": sure, we have ordered maps!).