[sddfd]

Jetstream, and even octane, are not relevant for most users.

JavaScript performance is good enough and has been for quite some time. (Server side node is another story)

If a website is slow, it is mostly because the website is shipping too much crap at the wrong time.

[sp332]

They don't matter for most pages, but sometimes you want to load up something heavyweight like Google Earth or an entire Win 3.1 PC https://archive.org/details/win3_TemIM3x