YouTube page load is 5x slower in Firefox and Edge than in Chrome because YouTube's Polymer redesign relies on the deprecated Shadow DOM v0 API only implemented in Chrome. You can restore YouTube's faster pre-Polymer design with this Firefox extension:https://addons.mozilla.org/firefox/addon/youtube-classic …
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That means the slowness is likely unrelated to the V0. The custom element polyfill is super fast. We’ve never managed to measure it being slower than native.
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AFAIK, the main perf issue is that it is UA-sniffing for Chrome and using HTML imports (injecting the polyfill for non-Chrome browsers). It's the main blocker for removing imports support: https://bugs.chromium.org/p/chromium/issues/detail?id=766694#c14 …
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