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How video impacts mobile web performance and UX, part 2: autoplay and audio

Posted on October 20th, 2017

Video has always been a great promotional tool and as the technology for better mobile performance has grown so has the demand for website development with videos as the main design element. Gaslight Media is sharing a three-part serious by Andy Favell on mobile video practices.

Mobile Video

Mobile video is a major up-and-coming trend in content, with brands everywhere converging on the new and lucrative mobile video market.

Mark Zuckerberg said on a recent shareholder conference call that he sees video as “a megatrend on the same order as mobile” – which makes mobile video, the intersection between the two, the ultimate sweet spot of engaging content to draw in new consumer eyeballs.

But sadly, there are still some technical hurdles to overcome before the mobile video experience is as smooth as companies would like it to be. In our previous installment we looked at how video can be a massive mobile data hog, and why it shouldn’t (but still does) have an impact on download speed.

In this part we’ll look at the contentious subject of autoplaying videos and their impact on mobile webpage performance, as well as how audio can delay page speed, and what kind of conditions make for a poor viewer experience (VX).

Our third and final part will consider some solutions that webmasters can enact to counter the issues with mobile video.

Video autoplay and page performance

Comparing the data on HTTP Archive for average content for the top 100 most popular sites (according to Alexa) with the top 1 million (shown above) reveals some interesting stats.

On average, video content is just 17kB (rather than 128kB) which is 2.1% of total page size, which, is a (comparatively) slender 828kB.

There are three reasons why this might be:

  1. Top sites avoid using video. (Considering these include video specialist like YouTube, BBC and CNN, this is the least likely of the three reasons).
  2. Top sites avoid using video on the (mobile) homepage. (The homepage of YouTube, for example, is made up of image links to videos, rather than videos themselves. Each video has its own webpage).
  3. Top sites use video more efficiently (as Dutton suggests).

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