HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>fx interval mid animation</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #bar { height: 20px; width: 40px; background: #16a34a; border-radius: 4px; position: relative; left: 0; }
    button { margin: 12px 8px 0 0; padding: 8px 12px; }
    #status { margin-top: 12px; color: #64748b; font-size: 14px; }
  </style>
</head>
<body>
  <div id="bar"></div>
  <button type="button" id="go">Start long animate</button>
  <button type="button" id="change">Set interval=50 mid-run</button>
  <button type="button" id="stop">Stop all, then set 50</button>
  <p id="status">Official rule: no animation running when you change fx.interval.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $("#go").on("click", function () {
      jQuery.fx.interval = 13;
      $("#bar").stop(true, true).css("left", 0).animate({ left: 240 }, 5000);
      $("#status").text("Animating with interval 13…");
    });
    $("#change").on("click", function () {
      jQuery.fx.interval = 50;
      $("#status").text("Changed to 50 mid-run — may have NO effect until animations stop.");
    });
    $("#stop").on("click", function () {
      jQuery.fx.stop();
      jQuery.fx.interval = 50;
      $("#status").text("Stopped all, set interval=50. Start animate again to apply.");
    });
  </script>
</body>
</html>

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jQuery.fx.interval — mid-animation change (Try It)