printout times SunOS spooler ./. CUPS 1.4.3

[Matthias Apitz]

Hello,

we are migrating SunOS customers from the old SunOS spooler lpsched to CUPS
1.4.3 and are facing the following interesting problem:

in both systems the LAN printer is configured as raw IP to port 9100 and it
is the same model;

if you fire up 20x "lp -c -d druck6 file" from a shell script or with CUPS
20x "lpr -l -P druck6 file" with the same ~1 KByte PCL file, it takes

lpsched: 92 secs
CUPS: 203 secs

and you can hear short delays while the pages send out from CUPS get
printed;

before watching the details with TCPDUMP, is there any explanation for this?
note: it is only plain PCL, no PostScript gets involved;

Thanks

        matthias