Have you gone through this troubleshooting guide?
It seems that your laptop is not being able to cope up with computational power requirement of FlytSim.
Please send me your
- laptop specifications.
- FlytSim version
- Are you running it using Docker ? If yes, what is your host OS?
I would suggest you to use APM sitl which has much less power requirement, unless you have a very specific need for PX4 sitl.