October 2017
Intermediate to advanced
370 pages
8h 57m
English
Measuring web performance is complicated. Since we are interested ultimately in providing a good user experience, this means we are interested in optimizing for the user's perception of how quickly the page loads, rather than an absolute, objective measure of how fast the entire page actually loads. You can think of it as building an illusion for the user: use a bunch of tricks to get just enough of the page rendered so the user thinks it has loaded, and in the meantime finish the job in the background.
When performance-tuning a web page, we need to optimize for getting something usable onto the user's screen as quickly as possible. This has an impact on what we must focus on to make a page seem fast: things ...
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