This is a list of optimization patterns; it's not an analysis of how much actual code gets sped up, and it doesn't consider the accommodations that would be made in the alternative universe: where defined signed overflow is the default, and there are other tools for when this impacts performance too much.
The question is if the alternative universe is better than this one, where you have to work harder to protect against unwanted overflow - and especially the compiler eliminating your efforts to test whether it occurred or not.
The alternative universe includes a different C++ standard and potentially additional language constructs or types to opt out. Different defaults have cultural implications far beyond the mechanics of any single compile.
The question is if the alternative universe is better than this one, where you have to work harder to protect against unwanted overflow - and especially the compiler eliminating your efforts to test whether it occurred or not.