I have an idea: why not speed up your site by NOT running js at all?
from the link you provided…
Be respectful. Anyone sharing work is making a contribution, however modest.
Ask questions out of curiosity. Don't cross-examine.
Instead of "you're doing it wrong", suggest alternatives. When someone is learning, help them learn more.
When something isn't good, you needn't pretend that it is, but don't be gratuitously negative.
Reflexive snark comment that's not even about the thing being shown is none of that. And there's also
Please don't post shallow dismissals, especially of other people's work.
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You clearly don't like my idea, but that doesn't mean it isn't valid.
This is really about how to make your UI more responsive by performing intensive tasks only when your browser isn’t doing any other tasks related to the javascript code.
In non JS applications, you typically would do this on any thread but the UI thread. But with Javascript, you have the option of doing tasks on the main thread, but only when all other tasks are not being executed. IE a priority queue.
ducks
At least in the old days if CSS or JS didn't load, you still got a semi-usable page.
Turning HTML+CSS+JS into an application platform has been one of the most fundamentally stupid things we've done as a field and we'll keep paying for it for years on end, second only to not adding slices to C.