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> largest JS codebases in the world.

I'd love to know how they make frontends as responsive as possible. To the engineering blog!

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They're very involved in web standards. Rob Palmer from Bloomberg is co-chair of TC39.
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We’re in the middle of TC39 plenary in Tokyo right now as a matter of fact! Rob regularly posts on X as things advance through the staging process, and today is the final day.

Agenda: https://github.com/tc39/agendas/blob/main/2026/09.md

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Here’s a great talk to get you up to speed! https://youtu.be/y1MCLZm8yAY
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From memory when I worked there 10 years ago, all the Javascript based stuff was pretty slow in a very noticeable way. They've likely gotten better as they are using a well known Javascript and rendering engine, so they're getting many optimizations for free.
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It's not very responsive
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