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The site[0] works for me in Edge, and Firefox, as intended. The slow loading is the point, you should see how it updates real time, which doesn't happen to you for some reason. As other comment suggests, maybe something on your network doesn't like tiny (~42 characters) HTML fragments.

[0] : https://ooo.lamplightdev.workers.dev/

Firefox just added support for declarative shadow dom, so that might be it if you're not on the latest version.

Alternatively I could imagine some kind of proxy between you and the site buffering things up.

> some kind of proxy between you and the site buffering things up.

Yeah I think that might be it, because it works fine on FF (iOS) outside.

Also for me, both on Firefox and Edge - I'm wondering if it's to do with being behind a corporate proxy that MITMs everything and might be buffering rather than passing through partial respones, or has a much higher threshold before streaming?

If that is the reason, it'll provide an (even more than usually) poor experience for those behind such a proxy

It worked fine for me in Firefox.