<p dir="auto">Changeset show action generates a sql query for each element to get its tags:</p>
<pre class="notranslate"><code class="notranslate">  OldWayTag Load (0.5ms)  SELECT "way_tags".* FROM "way_tags" WHERE "way_tags"."way_id" = $1 AND "way_tags"."version" = $2  [["way_id", 52], ["version", 1]]
  ↳ app/models/old_way.rb:82:in `to_h'
  OldWayTag Load (0.4ms)  SELECT "way_tags".* FROM "way_tags" WHERE "way_tags"."way_id" = $1 AND "way_tags"."version" = $2  [["way_id", 53], ["version", 1]]
  ↳ app/models/old_way.rb:82:in `to_h'
  OldWayTag Load (0.3ms)  SELECT "way_tags".* FROM "way_tags" WHERE "way_tags"."way_id" = $1 AND "way_tags"."version" = $2  [["way_id", 54], ["version", 1]]
  ↳ app/models/old_way.rb:82:in `to_h'
  OldWayTag Load (0.3ms)  SELECT "way_tags".* FROM "way_tags" WHERE "way_tags"."way_id" = $1 AND "way_tags"."version" = $2  [["way_id", 55], ["version", 1]]
  ↳ app/models/old_way.rb:82:in `to_h'
  OldWayTag Load (0.4ms)  SELECT "way_tags".* FROM "way_tags" WHERE "way_tags"."way_id" = $1 AND "way_tags"."version" = $2  [["way_id", 56], ["version", 1]]
  ↳ app/models/old_way.rb:82:in `to_h'
  OldWayTag Load (0.3ms)  SELECT "way_tags".* FROM "way_tags" WHERE "way_tags"."way_id" = $1 AND "way_tags"."version" = $2  [["way_id", 57], ["version", 1]]
  ↳ app/models/old_way.rb:82:in `to_h'
  OldWayTag Load (0.3ms)  SELECT "way_tags".* FROM "way_tags" WHERE "way_tags"."way_id" = $1 AND "way_tags"."version" = $2  [["way_id", 58], ["version", 1]]
  ↳ app/models/old_way.rb:82:in `to_h'
</code></pre>
<p dir="auto">It's possible to roll them into one query. Classic pagination has a parameter for that.</p>
<pre class="notranslate"><code class="notranslate">  OldWayTag Load (0.3ms)  SELECT "way_tags".* FROM "way_tags" WHERE "way_tags"."way_id" IN ($1, $2, $3, $4, $5, $6, $7) AND "way_tags"."version" = $8  [["way_id", 52], ["way_id", 53], ["way_id", 54], ["way_id", 55], ["way_id", 56], ["way_id", 57], ["way_id", 58], ["version", 1]]
  ↳ app/views/changesets/show.html.erb:82
</code></pre>

<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/4569'>https://github.com/openstreetmap/openstreetmap-website/pull/4569</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href="https://github.com/openstreetmap/openstreetmap-website/pull/4569/commits/9e3db5bbb83a646771296e04733c231b9b0ab503" class="commit-link">9e3db5b</a>  Preload element tags when showing changesets</li>
</ul>

<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/openstreetmap/openstreetmap-website/pull/4569/files">1 file</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/4569/files#diff-cf3fe9dc357f802fd9155582ffc8c6f71185065267991a2135323ad2d044b4f3">app/controllers/changesets_controller.rb</a>
    (6)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/4569.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/4569.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/4569.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/4569.diff</a></li>
</ul>

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