Note that on Linux, the performance difference between processes and threads is an awful lot smaller than it was when threads first came into the world. This is

Note that on Linux, the performance difference between processes and threads is an awful lot smaller than it was when threads first came into the world. This is another case where someone invented a better idea for performance reasons, and the people in charge of the old idea (processes) realized that they could do a lot better. So they did. And nowadays few people have a real need to squeeze every bit of performance out of a server. For most of us it is a question of buying one or two more servers. Only the Googles of the world really need to deal with this kind of performance tweaking, and if you look at what they are doing, it does not include Javascript.