Why UE4 becomes stuttered after play if the rosbridge_server in another machine doesn't open? #175

In my case, I run UE4(with ROSIntegration) in win10 but I didn't start the rosbridge_server(rosbridge_tcp) in another pc. However. After I clicked the "Play" button, the UE4 world became stuttered. This will also happen if I terminate the rosbridge_server on purpose.