Try to change the port:
Right click on Driver, click on "Printer Properties", click on ''Ports'' tab click on "Configure port" and change from RAW to LPR, at the Queue name write "lp" and be sure to unchecked "LPR Byte Counting Enable" and "SNMP Status Enabled".
My Phaser 6510 started printing very slow. It takes hours to start to print any jobs that I want printed
I have windows 10 version 10.0.17134 build 17134
I have the latest drivers loaded, as well I updated the bios to the latest version.
it is installed on my network and I have same issue no matter what PC I use