# How to speedup gazebo/sitl\_multiple\_run.sh simulation **URL:** \ **Category:** Uncategorized\ **Created:** [February 7, 2023, 9:20am UTC](https://discuss.px4.io/t/how-to-speedup-gazebo-sitl-multiple-run-sh-simulation/30728 "2023-02-07T09:20:13Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![joshikaNamani](https://discuss.px4.io/user_avatar/discuss.px4.io/joshikanamani/32/9870_2.png) [@joshikaNamani](https://discuss.px4.io/u/joshikaNamani)\ **Post date:** [February 7, 2023, 9:20am UTC](https://discuss.px4.io/t/how-to-speedup-gazebo-sitl-multiple-run-sh-simulation/30728/1 "2023-02-07T09:20:13Z")
Hi, I’m using ./Tools/simulation/gazebo/sitl\_multiple\_run.sh -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. ---
**Author:** ![Jhiggy](https://discuss.px4.io/user_avatar/discuss.px4.io/jhiggy/32/12092_2.png) [@Jhiggy](https://discuss.px4.io/u/Jhiggy)\ **Post date:** [February 9, 2023, 8:58pm UTC](https://discuss.px4.io/t/how-to-speedup-gazebo-sitl-multiple-run-sh-simulation/30728/2 "2023-02-09T20:58:34Z")
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](https://answers.ros.org/question/9747/how-can-i-speed-up-simulation-in-gazebo/) ---
**Author:** ![joshikaNamani](https://discuss.px4.io/user_avatar/discuss.px4.io/joshikanamani/32/9870_2.png) [@joshikaNamani](https://discuss.px4.io/u/joshikaNamani)\ **Post date:** [February 10, 2023, 4:28am UTC](https://discuss.px4.io/t/how-to-speedup-gazebo-sitl-multiple-run-sh-simulation/30728/3 "2023-02-10T04:28:29Z")
Thanks for your response, I’m using Ubuntu 20.08 with Core i7 and NVIDIA T400 4GB Graphic card.