Social code hosting service GitHub isn’t just a free, easy way to host and share your code; it’s also a huge CSS and HTML testing ground with experience writing a fast, scalable code.
So what has GitHub learned from running a hugely successful site? That surprisingly small changes to both HTML and CSS can have a huge impact on performance.
GitHub’s Jon Rohan gave a talk about some of the service’s performance problems and solutions at the CSS Dev Conference in Honolulu earlier this year. (The slides are available on Speaker Deck.) The whole video is worth watching, but the key takeaway is that the right small changes in your code can have a huge impact on performance.
Many of Rohan’s suggestions for faster CSS will be familiar to anyone who’s used YSlow and other performance tools — get rid of unnecessary tag identifiers in your CSS, i.e., div.menu becomes just .menu, eliminate ancestors where possible and avoid chaining your CSS selectors.
GitHub is undeniably different than most websites — especially pages like the Git diff views, which involve considerably more code than most pages will need. But, while GitHub may be the extreme example, in many cases the same small changes can help speed up much simpler pages as well.