I vividly remember our discussion as to whether AMP should use HTML imports as the one time Alex was wrong and Malte was right 
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Replying to @cramforce @patmeenan and
You were totally, absolutely right.
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Replying to @slightlylate @cramforce and
FWIW, YT ships with exactly two (2) HTML imports because they bundle, so it's pretty inconceivable that HTML imports is a major contributor.pic.twitter.com/2tDld2rviU
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Replying to @kevinpschaaf @slightlylate and
This is getting more and more interesting!
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Replying to @kennethrohde @kevinpschaaf and
Alright folks, I did the unthinkable and tried this out myself. Seems to work fine. But A LOT OF STUFF is going on. Could see this going badly on a slower computer or slower browser. This is the type of website
@slightlylate yells at.1 reply 0 retweets 4 likes -
Replying to @cramforce @kennethrohde and
I guess the right answer is to profile what's happening in Firefox :-)
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Replying to @jwajsberg @cramforce and
Would help if we can get examples where it is 5x slower to make sure we're looking at the same thing (or to step down the rhetoric a bit). Most I have ever seen is 10-20%. 500% would likely be something pathological.
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Replying to @patmeenan @jwajsberg and
I saw 5 second load times in Firefox and Edge yesterday and over the last two weeks on two different computers (MacBook Pro and Windows 10 laptop), but now I only see a big difference in Edge. I and others noticed a big perf drop about two weeks ago.
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Replying to @cpeterso @patmeenan and
Chris Peterson Retweeted Alex Russell
Above
@slightlylate said YouTube uses Shady DOM in all browsers. https://twitter.com/slightlylate/status/1022159570515312647?s=21 … But I see Firefox and Edge load the webcomponents-lite.min.js polyfill, but not Chrome. Is webcomponents-lite.min.js not Shady DOM?Chris Peterson added,
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Replying to @cpeterso @jwajsberg and
That's the polyfill for HTML imports (which aren't needed in Chrome).
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It also polyfills Custom Elements which Firefox is also lacking support for.
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Replying to @slightlylate @patmeenan and
The CE polyfill does very little but it shows up in profiles because it is at the bottom of basically every callstack.
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