Download yslow by yahoo! and check out the result. Result shows how many http requests are made in a page, whether expires header is set or not, whether GZip is used or not, whether page contains CSS at the top, whether page contains javascript at the bottom, whether js is minified, etc.
Which are all good signs if they are passed.
If you’ve ever read the series of Performance Research by yahoo UI blog, you know what they are for.
Knowing how to code is very important. However, that is just the beginning of becoming a frontend engineer/developer. It’s the best to know how to optimize a site in terms of performance on top of that. There are several factors that would slow down the performance of the site. But at the end it comes down to these two things: Backend and Frontend. So if you want to become a good frontend engineer/developer, you should be able to see how those are affecting your site.
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