<p dir="auto">Full discussion here: <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2420889941" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/5009" data-hovercard-type="pull_request" data-hovercard-url="/openstreetmap/openstreetmap-website/pull/5009/hovercard?comment_id=2722980833&comment_type=issue_comment" href="https://github.com/openstreetmap/openstreetmap-website/pull/5009#issuecomment-2722980833">#5009 (comment)</a> But I'll duplicate the comment here.</p>
<p dir="auto"><a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2420889941" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/5009" data-hovercard-type="pull_request" data-hovercard-url="/openstreetmap/openstreetmap-website/pull/5009/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/pull/5009">#5009</a> brought two problems:</p>
<ol dir="auto">
<li>When moving the map, a white flash occurs and all objects on the map are redrawn:</li>
</ol>
<p dir="auto"><a href="https://github.com/user-attachments/assets/3c87c769-174c-4513-a5be-115eb9517bb8">https://github.com/user-attachments/assets/3c87c769-174c-4513-a5be-115eb9517bb8</a></p>
<ol start="2" dir="auto">
<li>Rendering slowed down. What used to occupy ~400ms now occupies ~1.3s. Hiding a data layer was previously performed on ~100ms, now ~1.5s (!)</li>
</ol>
<p dir="auto">Both problems arise due to the fact that before that the redrawing of the map was performed only once, after the completion of the removal/adding of objects to the SVG-element of the map.</p>
<p dir="auto">--</p>
<p dir="auto">This PR only removes asynchronous rendering. The loader that shows downloading data near the checkbox remains.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/5877'>https://github.com/openstreetmap/openstreetmap-website/pull/5877</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href="https://github.com/openstreetmap/openstreetmap-website/pull/5877/commits/8308ac960bbeb45313494f9bb16a0d0ca8b1cea7" class="commit-link">8308ac9</a>  Disabling asynchronous data layer rendering</li>
</ul>

<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/openstreetmap/openstreetmap-website/pull/5877/files">1 file</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5877/files#diff-f060eef487077b042f45b3a12e7a2cbd54a446f8c744cdb98405a1295430e8b9">app/assets/javascripts/leaflet.map.js</a>
    (2)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/5877.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/5877.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/5877.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/5877.diff</a></li>
</ul>

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