I'm with John_Keates on this one. In the age of broadband connections, it's easy to forget that optimizing a site still matters - a lot. especially with the expanding mobile internet share of total surf time. Testing a site that loads fine, and "fast enough" on a dev. server is one thing, but even a line or two of unnecessary code here and there soon add up to a whole lot. Never underestimate the power of an optimized (read: slim) site to better meet needs and expectations both of the site owner and the site visitors.