If you want to control it manually, you can use:
engine.runRenderLoop(function () {
if(!scene.paused){
scene.render();
}
});
for you own render loop and set scene.paused when you want.
Or
scene.freezeActiveMeshes();
according to docs
BUT. I think you can’t control it in automatic way
And you have to know by youself that’s nothing changing in your core right now