Why is Canon mf4570dn scanning very slow over network?

Question

Computer networks

Good day ... There is a Canon mf4570dn MFP. Everything worked perfectly, in one day the scanning speed decreased significantly. More precisely, scanning proceeds as usual, but processing in MF Tools (green loading bar) takes longer than necessary (usually 18-24 s, now 50-60 s) and you have to wait for it to complete. When scanning a large stack of documents, a lot of time is spent. The MFP is connected via LAN, I tried via USB (it works quickly, it seems that the problem is in the network) ... What could be the problem?
I tried to reset all settings on the printer, reinstalled the drivers, it also scans slowly from another computer, turned off antiviruses, DPI does not affect, rebooted the switch (Cisco Catalyst 2960)

Answer 1

Try to clean all the optics, I already had this somewhere ...

Answer 2

MF8580Cdw. The same problem. What for wifi, what for lan scans 3-4 times slower than for usb. No solution was found. Complain on the internet but no solution. Either there is a magic button that will fix everything, or this shaitan works this way by default. Soon I feel we will throw it away, it's a pity, it prints in color perfectly!