JSXGraph
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Slow the turtle down
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<iframe 
    src="https://jsxgraph.org/share/iframe/slow-the-turtle-down" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Slow the turtle down" 
    allowfullscreen
></iframe>
This code has to 
<input type="button" value="run" onclick="run(100)">

<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution ShareAlike 4.0 International License.
    https://creativecommons.org/licenses/by-sa/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-250, 250, 250, -250], keepaspectratio: true });
    var t = board.create('turtle', [100, -50], { strokeOpacity: 0.7, fillColor: '#ff8800', fillOpacity: 0.2 });
    t.setPenSize(3);
    
    function run(n) {
        if (n > 0) {
            t.fd(20);
            t.lt(90 * (1 - n / 100));
            var st = 'run(' + (n - 1) + ')';
            setTimeout(st, 25);
        }
    }
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution ShareAlike 4.0 International License.
https://creativecommons.org/licenses/by-sa/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-250, 250, 250, -250], keepaspectratio: true });
var t = board.create('turtle', [100, -50], { strokeOpacity: 0.7, fillColor: '#ff8800', fillOpacity: 0.2 });
t.setPenSize(3);

function run(n) {
    if (n > 0) {
        t.fd(20);
        t.lt(90 * (1 - n / 100));
        var st = 'run(' + (n - 1) + ')';
        setTimeout(st, 25);
    }
}
This is an example, where the turtle speed is controlled by the setTimeout() method of JavaScript.
<input type="button" value="run" onclick="run(100)">
// Define the id of your board in BOARDID

var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-250, 250, 250, -250], keepaspectratio: true });
var t = board.create('turtle', [100, -50], { strokeOpacity: 0.7, fillColor: '#ff8800', fillOpacity: 0.2 });
t.setPenSize(3);

function run(n) {
    if (n > 0) {
        t.fd(20);
        t.lt(90 * (1 - n / 100));
        var st = 'run(' + (n - 1) + ')';
        setTimeout(st, 25);
    }
}

license

This example is licensed under a Creative Commons Attribution ShareAlike 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.