Developers like speed, and Facebook obliged by revamping its like box, saying in a note on the Facebook Engineering page that the plugin is now two to four times faster after being rebuilt from the ground up.
The social network offered more details on how it was able to boost the performance of its like box:
- New, smaller components: The plugin is made of little components (box, buttons, etc.), and we’ve simplified and cleaned those up to use fewer bytes in HTML markup and CSS. The total CSS is reduced to the point of being small enough to go in the HTML as a style tag. This may seem controversial (external stylesheets can be cached, inline styles cannot), but in our experiments, we’ve seen that it’s better to have the (small amount of) CSS inline. Otherwise the browsers block the rendering of the page, waiting for yet another HTTP request to complete.