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HP LaserJet Flow MFP M630z - Slow printing over Network and USB

HP Recommended
HP LaserJet Flow MFP M630z
Microsoft Windows 10 (64-bit)

Hi,

 

we use the HP LaserJet Flow MFP M630z (Model# B3G86A), with a high volume input tray and the mailbox-output. The printer is connected to the network via a 1Gbit Ethernet connection (the printer also recognises the connection speed as 1000 Mb/s). Multiple Windows 10 PCs are connected to the printer via network. These are connected to the printer via IPP.
Recently the printing speed is very slow. The first report was after a holiday. Over the holidays I switched some PCs the print via a CUPS printing server (this change was for statistics and print-job backup). After this, many employees reported slow printing from the Computers printing via CUPS and from the Computers connected "normally".

I was experiencing slow connection speeds bevor, when connecting to the web interface (pages load for far longer than 30s). This was since the Firmware-Update to the current major version, but printing was never a problem.

 

Printer Firmware is up to date and all Clients use the latest driver. I have already checked this guide but it didn't help my problem.

 

I am still trying to diagnose the problem, but I think the problem is the connection speed to the printer. Does anybody have any ideas on how to diagnose/fix the problem or maybe has encountered a slow printing speed over network themselves? Any input is welcome. Thanks!

 

Some interesting tidbits:

  • Printing over USB is just as slow as over network
  • The software we use, prints standardised documents via something called a "Java-Print-Job". These are especially slow, but I do not know what format hides behind the "Java-Print-Job"
  • When printing from LibreOffice/OpenOffice printing is fast again. I have only tested text. I have not tested printing from MS-Word.
  • Printing PDFs is similarly slow to the "Java-Print-Job"
  • After our warranty expired, I also tried switching the 
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Additional Tidbit:

  • After Restarting, the printer runs fast, for about an hour. After that it's back to normal/slow
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