<blockquote>
<p>I should have said, if there's specific API changes that you're thinking about, even if they are just to illustrate a point, let me know and I'll see how they fit.</p>
</blockquote>
<p>Just off the top of my head, we'd see some immediate performance improvement on the iD side from:</p>
<ul>
<li>JSON API (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="440473793" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/2221" data-hovercard-type="pull_request" data-hovercard-url="/openstreetmap/openstreetmap-website/pull/2221/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/pull/2221">#2221</a>)</li>
<li>Multi-fetch GET with /full (<a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="479747839" data-permission-text="Issue title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/2348" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/2348/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/issues/2348">#2348</a>)</li>
</ul>
<p>(these require some coordination from the CGImap side too, but I don't think that's a blocker)</p>

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