This is one way I can classify websites:
a) those that reload on every little matter - you add a comment-they reload, the live score updates-they reload the whole page, instead of just the score..
b) some like superuser.com these websites do not reload when there is no need, like adding a comment, etc.
I find the second ones convenient, I guess everyone does. So why does not everyone make websites like that?
Technically, where does the difference lie among the two types I mentioned??