[svdree]

That sounds reasonable, until you have to debug an issue that only manifests itself when working with a huge dataset, in which case the whole thing becomes pretty much unusable. As the article says, debug mode is expected to be slower, but the difference between MSVC and the other 2 is just crazy.

[MauranKilom]

It's crazy because the knob for "how much debugging do I want to do" (aka iterator debug level) has been left untouched. Do you want the most rigorous checks (the default)? Don't do anything. Just want to avoid "variable optimized out" while debugging? Turn iterator debug level to "none".