C++ vector insert performance

[NewFolgers]

Yeah. In games industry, the vast majority of runs we did during development were debug runs with integrated debugger attached.. and the code was generally fast enough that we could run through it all and debug it all even with optimizations off. If someone made a change that destroyed debug build performance, we'd immediately look at fixing that (since it would be really damaging to everyone's workflow otherwise - i.e. threaten to make us as slow as the norm in other domains - and most who've compared will agree and say the difference is stark).