I’ve been using FitVids.js in a lot of recent themes to ensure video displays nicely in responsive layouts. I wrote about this in detail for a previous post. The FitVids script is super tiny (1.7k), and I generally concat it will all my other scripts and then minify using Grunt. So, it’s really not a lot of additional page weight to include the script. However, I was just clued into an alternate method when doing a theme review for the Make theme on wordpress.org that could be slightly more efficient. Generally FitVids will only be required if video is loaded via an oEmbed (YouTube, Vimeo). So, if we hook into the oEmbed and already have the FitVids registered to load in wp_footer, we can just enqueue the script when it is needed. How it Works I’ve tested it with my most recent theme, and this method works well. If you visit the home page, you can see FitVids is not enqueued. But if you go to the News or the Video Post, you can see that it is. Worth It? Loading an extra script requires an additional HTTP request. So, if your theme is being specifically marketed for a video audience- it probably makes sense to just minify and concat. However, if video is just in one or two posts on the
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