Improve performance of lib during initialization phase

[mihalikv]

Description

If I have following page:

<div hx-boost="true">
    <a href="https://htmx.org/">asdasdasd</a>
</div>
<a href="https://www.google.com/">test</a>
... thousand of same link
<a href="https://www.google.com/">test</a> 

htmx on load will init all of the links on the page. However, it's necessary to init htmx only on one link inside hx-boost wrapper. This can result in poor performance on pages with lot of "plain" links.

Performance on page with 1K links (6 x slowdown):
Before:

After:

Testing

I have test the performance and simple boosted link.

Checklist

• I have read the contribution guidelines
• I have targeted this PR against the correct branch (master for website changes, dev for
  source changes)
• This is either a bugfix, a documentation update, or a new feature that has been explicitly
  approved via an issue - I hope that it's bugfix
• I ran the test suite locally (npm run test) and verified that it succeeded

[Telroshan]

Btw, is the performance still good with the requested changes @mihalikv ?
Just to make sure it still matches your initial intent, as the numbers above come from the first version of this PR if I'm not mistaken

[alexpetros]

Needs to be rebased but this is a good change

[mihalikv]

Btw, is the performance still good with the requested changes @mihalikv ? Just to make sure it still matches your initial intent, as the numbers above come from the first version of this PR if I'm not mistaken

Yeah it looks good.