Making an efficient program these days means using an efficient stack, working with threads to avoid blocked code, fighting the other 100+ processes on the CPU

Making an efficient program these days means using an efficient stack, working with threads to avoid blocked code, fighting the other 100+ processes on the CPU for resources and possibly avoiding the same on a database server, possibly on the other side of the world. In many ways its a lot harder than the early 80's where you had no networks, diddnt have to worry about security and generally total control of the local OS/CPU.