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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fx interval slow vs default</title>
  <style>
    body { font-family: sans-serif; padding: 16px; }
    .box { width: 40px; height: 40px; background: #2563eb; border-radius: 6px; margin: 12px 0; position: relative; left: 0; }
    button { margin: 4px 8px 4px 0; padding: 8px 12px; font-size: 13px; }
    #status { margin-top: 12px; color: #64748b; max-width: 32rem; font-size: 14px; }
  </style>
</head>
<body>
  <div class="box" id="a"></div>
  <button type="button" id="slow">interval=50, animate</button>
  <button type="button" id="fast">interval=13, animate</button>
  <button type="button" id="reset">Reset boxes</button>
  <p id="status">Stop all animations before changing fx.interval (official rule).</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function run($el, ms) {
      jQuery.fx.stop();
      jQuery.fx.interval = ms;
      $el.stop(true, true).css("left", 0).animate({ left: 220 }, 2000);
      $("#status").text("Set interval to " + ms + " ms, then started 2s animate.");
    }
    $("#slow").on("click", function () { run($("#a"), 50); });
    $("#fast").on("click", function () { run($("#a"), 13); });
    $("#reset").on("click", function () {
      jQuery.fx.stop();
      jQuery.fx.interval = 13;
      $(".box").stop(true, true).css("left", 0);
      $("#status").text("Reset to default interval 13.");
    });
  </script>
</body>
</html>

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jQuery.fx.interval — slow vs default (Try It)