Update app.py

app.py

@@ -606,6 +606,22 @@ async(p, d, n)=>{
     if (document.getElementById("iframe3D")===null || typeof document.getElementById("iframe3D")==="undefined") {
       if (BABYLON && BABYLON.Engine.LastCreatedScene) {
         BABYLON.Engine.LastCreatedScene.onAfterRenderObservable.add(function() { //onDataLoadedObservable
+
+          var then = new Date().getTime();
+          var now, delta;
+          const interval = 1000 / 25;
+          const tolerance = 0.1;
+          try {
+            BABYLON.Engine.LastCreatedScene.getEngine().stopRenderLoop();
+            BABYLON.Engine.LastCreatedScene.getEngine().runRenderLoop(function() {
+                now = new Date().getTime();
+                delta = now - then;
+                then = now - (delta % interval);
+                if (delta >= interval - tolerance) {
+                    BABYLON.Engine.LastCreatedScene.render();
+                }
+            });
+          } catch(e) {alert(e);}
         
           var bg = JSON.parse(document.getElementById("bgcolor").getElementsByTagName("textarea")[0].value);
           BABYLON.Engine.LastCreatedScene.getEngine().setHardwareScalingLevel(1.0);