It's not that there are no opportunities left: there's plenty of inefficiency all around. For example, this recent email details a floating-point formatter that is 4-6 times faster than glibc printf: http://gcc.gnu.org/ml/libstdc++/2014-01/msg00017.html Yes, that's right, it's that much faster than the C printf function that everyone has been using for decades.
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It's not that there are no opportunities left: there's plenty of inefficiency all around. For example, this recent email details a floating-point formatter that is 4-6 times faster than glibc printf: http://gcc.gnu.org/ml/libstdc++/2014-01/msg00017.html Yes, that's right, it's that much faster than the C printf function that everyone has been using for decades.