[Observium] Discovery of large stack causes hardware to become unresponsive

Hello I are testing Observium in a new environment after previous success stories elsewhere. We have noted that when we run device discovery on a stack of 5 Cat3750 (12.2-50-SE1) the "device" becomes unresponsive to any other queries / pings / ssh for approximately 5-6 minutes (during the discovery cycle).

Once the discovery is complete, the poller, pings, and other operations return to normal. Note that traffic flow does not appear to be affected across the switch.

Total ports on the stack are 278 (no argument that it is a large number of ports to poll from a single device).

Regular polling of the device does not appear to have any consequences, it is specific to the discovery module.

Does anyone have any insight into this?

Thanks Patrick