Delay in print processing may cause print jobs not to finish in time

The issue was identified by the upstream cups project and a fix was introduced in cups-2.2.8:

The cupsCreateJob, cupsPrintFile2, and cupsPrintFiles2 APIs did not use the supplied HTTP connection (Changelog )

When looking at an strace output of an lpr command, a high number of recvfrom is seen:

localhost:~ # strace -c lpr -Ppdfprint /etc/hosts
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
99.96    0.613015           1    451790         5 recvfrom
[...]
------ ----------- ----------- --------- --------- ----------------
100.00    0.613264                452291        19 total

The code was changed from using cupsEnumDests (which called cups_create_cb a very high amount of times to get the destination of a printer) to cupsGetNamedDest which reduced the number of calls tremendously. 

After installing the fix:

localhost:~/PTF-1189517-cups_slow # strace -c lpr -Ppdfprint /etc/hosts
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
95.50    0.008879           1      5580         4 recvfrom
[...]
------ ----------- ----------- --------- --------- ----------------
100.00    0.009297                  6018        20 total

Please note: Above values have been captured on a test system and may not reflect production systems!