A few years ago, our CTO and I read Andrew King’s Speed Up Your Site book and became consumed with improving performance of our customer web sites. We decreased download time for one site by 75%. These changes prevented us from hitting our network capacity long enough to move to a new hosting facility where we weren’t constrained by bandwidth.
What amazes me is how frequently developers ignore the simple things that can be done to speed up their web applications. Most web servers contain options to supply their content in gzipped form. This option alone can save tremendous time for users and bandwidth costs for companies.
I have a short list of books that I wish everyone who develops online would take the time to read. Speed Up Your Site is near the top of that list.
P.S. I was pleased to find that my new hosting environment appears to be using gzip by default. The home page would be 19K uncompressed, but is delivered to the browser as a 4K gzipped file.