<p></p>
<p><b>@tomhughes</b> requested changes on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5402#discussion_r1986287881">app/assets/javascripts/heatmap.js</a>:</p>
<pre style='color:#555'>> +
+  let cal = new CalHeatmap();
+  let currentTheme = getTheme();
+
+  function renderHeatmap() {
+    cal.destroy();
+    cal = new CalHeatmap();
+
+    cal.paint({
+      itemSelector: "#cal-heatmap",
+      theme: currentTheme,
+      domain: {
+        type: "month",
+        gutter: 4,
+        label: {
+          text: (timestamp) => I18n.strftime(new Date(2000, new Date(timestamp).getMonth(), 15), "%b"),
</pre>
<p dir="auto">If we've constructed a date from the timestamp why do you then extract the month from that and build a new date? If the format only uses the month the rest of the date doesn't matter?</p>
<p dir="auto">It might a bit faster to just lookup <code class="notranslate">I18n.t("date.abbr_month_names")</code> once before the paint call and then index that array with the month number rather than calling strftime repeatedly - just beware of 0/1 based indexing!</p>

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