time /usr/sbin/lpinfo -v >/dev/null
real    0m3.628s
user    0m0.016s
sys     0m0.016s

I think the delay happens during PPD search process. It's when the
printers respond with the make/model/driver query via ipp on port 9100.

I don't think there is a problem with system-config-printer per se. It's
a problem with network latency, aggravated by the quantity of printers
on our network. I'm sure there's an netstat on nmap command that would
verify this, but I'll claim ignorance. I can attest that cpu or disk
activity doesn't spike during the delay.

-- 
system-config-printer: no way to cancel 'searching for printers'
https://bugs.launchpad.net/bugs/139335
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