Why does the MFP take a long time to scan?

Question

Computer networks

Good day ... There is a Canon mf4570dn MFP. Everything worked perfectly, in one day the scanning speed decreased significantly. More precisely, the scanning goes as usual, but the processing in MF Tools (green loading bar) takes longer than necessary. When scanning a large stack of documents, a lot of time is spent. The MFP is connected via LAN, tried via USB (works fast) ... What could be the problem?
I tried to reset all settings on the printer, reinstalled the drivers, rebooted the switch (dpi does not affect) PS: Switch Cisco Catalyst 2960

Answer 1

Antivirus also sometimes slows down scanning. If there is an antivirus, disable it and try.