not worth the jump from open to close... a large margin when most pages already load almost instantly will go unnoticed by most people. I think that you would

not worth the jump from open to close... a large margin when most pages already load almost instantly will go unnoticed by most people. I think that you would see a much bigger performance increase if websites would not load resources from 10 different domains for serving a single web page (you have a much higher chance of getting some unforeseen delay from one of those hosts).