Mozilla exec says Google slowed YouTube down on non-Chrome browsers

From CNET: A Mozilla executive says Google's redesign has made YouTube slower on Firefox and Edge.

Chris Peterson, the software community's technical program manager, tweeted on Tuesday that the video sharing site loads at a fifth of the speed on non-Chrome browsers due to its architecture, as first reported by Sofpedia.

"YouTube's Polymer redesign relies on the deprecated Shadow DOM v0 API only implemented in Chrome," he wrote.

"YouTube serves a Shadow DOM polyfill to Firefox and Edge that is, unsurprisingly, slower than Chrome's native implementation. On my laptop, initial page load takes 5 seconds with the polyfill vs 1 without. Subsequent page navigation perf is comparable."

Peterson suggested fixes for both Firefox -- Mozilla's browser -- and Microsoft's Edge that revert YouTube to a previous version using add-ons.

He notes that YouTube "still serves the pre-Polymer design" to Microsoft's Internet Explorer 11, which launched in 2013 and has been replaced by Edge, and suggests that Google could have taken the same approach with Edge and Firefox.

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