This article, co-authored by Wayne Shea, is the fifth in a series of experiments describing the performance of web pages ( part 1 , part 2 , part 3 and part 4 ). You are probably wondering why productivity articles are on the YUI blog ( Yahoo! User Interface, Yahoo! user interfaces ). So it turns out that client-side programming, which is essentially equivalent to developing and creating user interfaces, has the greatest impact on the performance of web pages ( in light of the leading role of Yahoo! engineers in studying client-side performance, it’s probably more surprising that such articles are still in this blog, and not highlighted in a separate direction ).