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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So even on Chrome right?
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Correct. You can see this in DevTools; no Shadow DOM anywhere in sight:pic.twitter.com/znZwyMOpNl
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New conversation -
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So things will get faster when everyone moves to V1, which is in progress, but it's not (just) about Shadow DOM.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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& Web Standards TL; Blink API OWNER
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