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Citysim on Gazebo 9 seems slow


I've installed the latest Gazebo 9 and managed to run CitySim

However, I find that its really slow even if I run it on a high-spec AWS EC2 instance (tested on g2.8xlarge with 32 vCPU & 60 GB RAM). It doesn't look as smooth as the video in the blog post here

I also noticed that in the blog post, it points to a 'citysim branch' of Gazebo

So I'm wondering what's the difference between this branch and the now released Gazebo 9. Which version should I use? And will it make the simulation faster and smoother?