Larger postscript files are transmitted longer.

I am not sure but seems it is not printer problem. Any ideas what to check/change in ulpt?

It's worth trying unlpt.  But if the sending time is proportional to the file

already tried. The only difference is that printer doesn't know when each jobs end - so pressing "cancel" on printer by user mean nothing more will ever print after that ;) - as cancel works by ignoring data until end of job.

speed is same.

size, it's probably not that.

Yes it's not that. i tried making dumb 200MB postscript file and pressed cancel just after starting sending data. so printer just had to receive and ignore data - got 2.5MB/s with
cat file >/dev/ulpt0

tried

dd if=file of=/dev/ulpt0 bs=1m - same speed.

in actual printouts it's more like 200kB/s or less.

It may be printer's problem but not it's postscript processor

Kyocera FS-3920DN have identical CPU and identical amount of RAM and handles printouts by LAN at 100Mbit/s speed even on complex postscript files.

Do you have any idea what to check more ?

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