What exactly is Idle PC value in GNS3?
While simulating your network in GNS3, there is a possibility for 100% CPU usage of your computer. This is due to the Dynamics, the core emulator, doesn't know when the virtual router is idle, or when it’s executing tasks.
Idle PC value calculates the time when the IOS image is idle (not performing any task) and puts the router into an idle state (sleep mode).
Hence it significantly decreases CPU usage on the host without losing the virtual router’s capacity to do real work.
Bellow video will help you set IDLE-PC for virtual router or switch.
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