jMAVSim on Windows out of control

Hi.
I am using jMAVSim on widows to simulate quadcopter. I was able to connect jMAVSim to the Pixhawk. However, whenever I try to take off, the copter does not take off vertically and crashes itself to the ground.
I have updated the firmware through qgroundcontrol but it did not fix the issue.

What could be the reason for this?

The problem was that there was not enough CPU.
The quad became stable as soon as I killed some background process that was eating up the CPU.

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