improve hierarchy performance drastically
improve hierarchy performance drastically

the handler for zoom events used to call scope.render() for each and every fired event. That would be many when the user turned their mouse wheel.
Now the event handler sets a timeout instead => render() is only called once for every rush of zoom events, no longer for every single zoom event.

IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp,IPS-LMU/EMU-webApp