Hi,
It was observed that, sometime, Network settigns and application also plays a role in the slow Scanning / Pritning issue.
Would be ood to check the network settings option in the Administrative tab of Printer. Change the available options from Half duplex or full speed and check if that makes any improvement.
if you are facing slow printing issue with the devcie, Please verify, if the Driver has performed Bidi communicaition to get the Hardware capabiltiies to support the supported format. Check with another applciation and check if other application makes some improvement.
Hope this will help.
Although I am an HP employee, I am speaking for myself and not for HP