I think browser speed is a big issue. The BBC loses an additional 10% of users for every extra second it takes for its site to load. And when Yahoo! reduced it

I think browser speed is a big issue. The BBC loses an additional 10% of users for every extra second it takes for its site to load. And when Yahoo! reduced its page load time by just 0.4 seconds, traffic increased by 9% 1 second delay reduces customer satisfaction by 16% The longer a webpage takes to load, the more its bounce rate will skyrocket.