How to speedup gazebo/ simulation

I’m using ./Tools/simulation/gazebo/ -m iris upto 4 vehicles gazebo is running good, after 4 , its becoming slow, i have tried by increasing real_time_factor even though its slow, please help with this issue.

Thanks in advance.

This is going to be limited by your PC…A good graphics card and modern CPU would be required for more performance. What are you running it on?

This might guide you to the awnser: How can I speed up simulation in Gazebo? - ROS Answers: Open Source Q&A Forum

Thanks for your response,

I’m using Ubuntu 20.08 with Core i7 and NVIDIA T400 4GB Graphic card.