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Slow performance of Gazebo8 with actors


I need to simulate a very simple environment with a mobie robot and a human walking around it. I launch my simulation setup and everything is running properly. However Gazebo GUI responds very slowly. My computer is an Intel i7 and I could check using the system monitor that one CPU is working around 100% and it requires around 4GB of RAM (it has 8G). The behaviour is completely different if I run the simulation without the actor. The requirements of so many resources is something normal with actors or I could have something wrong configurated and that's why is not working properly?

Thanks in advance