Running lp or lpr to a remote server can take 8-10 seconds in RHEL 8

Issue

• We have over 22,000 print queues. When testing with dozen queues, it prints in hundredths of a second. However, as the number of queues on the print server increases, the amount of time required to send a print queue to the server increases. For example, with "ServerName=10.1.2.3" set in /etc/cups/client.conf and 22,000 queues defined on the server with the IP address 10.1.2.3:

  time echo -e "\r\nTesting 1 2 3\r\nTesting 1 2 3\r\nTesting 1 2 3\r\nTesting 1 2 3\r\n" | lp -d pr99
  request id is pr99-142 (0 file(s))
  
  real    0m9.876s
  user    0m5.325s
  

• Running something like

  lp -h 10.1.2.3 -p pr99 /etc/fstab
  

  or

  export SERVER_NAME=10.1.2.3:631
  lp -p pr999 /etc/fstab
  

  can take several seconds (or several minutes over a slow network link) if the remote server has tens of thousands of print queues defined.