also for webgpu (future safe)

Playground/js/mainWebGPU.js

@@ -153,7 +153,12 @@ compileAndRun = function(parent, fpsLabel) {
                         scene.render();
                     }
 
-                    fpsLabel.innerHTML = engine.getFps().toFixed() + " fps";
+                    // Update FPS if camera is not a webxr camera
+                    if(!(sceneToRender.activeCamera && 
+                        sceneToRender.activeCamera.getClassName && 
+                        sceneToRender.activeCamera.getClassName() === 'WebXRCamera')) {
+                        fpsLabel.innerHTML = engine.getFps().toFixed() + " fps";
+                    }
                 }.bind(this));
 
                 if (checkSceneCount && engine.scenes.length === 0) {