The current status of your devices is stored in:
But those files are not easy to interpret.
After changing the value of your shutter, you could store it inside a virtual device and use that to know the current state. It may be a bit faster, but almost nothing, as the current value of a devices is stored locally and updated only after the device tells PulseStation it’s value has changed.
It’s push from the devices, not pull from within PulseStation.