Don't forget the human time to debug the code (especially the rare or only-happens-under-load issues, which can be related to resource exhaustion, among other things).

Also, some of your examples (like altering or reviewing code) can become easier and faster if resource management is a first-class citizen in your code base or language (i.e. is either more explicit in the code, and you know to look for it and manage it, or it is somehow taken care of automatically by your language, so you would have a hard time forgetting it, even if it is handled implicitly).