I just wanted to say a big thank you to all of you in Webpagetest. It has helped me a lot with optimizing the sites I administer, and after some months of testing and work the results have been very satisfying.
I also found your links, during the test time, helpful, especially some links that recommended certain image optimization software.
On the overall, I got the sites to load between 1 and 3 seconds faster on average (depending on their pages and content), so this is quite a good result. And I have also noticed slightly better ranking afterwards. Although SEO remains the principal factor, websites with good enough and/or similar SEO to their competitors will go up the ranks a bit, when they’re faster.