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If you see ARP rquest for IP addresses not part of that subnet the sender has an incorrect subnet mask configured.
On any given day most domain controllers seem to want to connect to evrything they have in the machine list. If such a machine is not available it will try frequently which is seen by the ARP requests. Printers are among the devices that your domain controller like s to keep in touch with. Even if you scrapped the printer years ago.
None of this means you actualy have a problem by itself. But I would recomend digging in your domain controller and see where missing IP addresses ars still present and see if you can cleanuup stuff. Having obsolete stuff in your domain might expain some of the slowness you seem to experiencing.
