Bulk pdf files printing

[mdfurqan2012]

When i sent bulk pdf print of 500 pdf files in duplex mode 90ppm machines model ricoh aficio 2090 prints only 25ppm speed.
I notice that every job in printer queue have a one more duplicate job even if i print a test page it shows duplicate job but machine print a single test page.
If i sent a job of 500 pdf files printer queue shows 1000 jobs.
I installed original pcl6 driver from ricoh website.
Kindly help me

[bsm2]

what app is printing the PDF, if adobe try foxit reader
check settings if using adobe and update reader to lastest version

[peter42]

As far as i remember, a print to a tcpip-lpr-spooler,
it creates the printjob itself and a spooler-control file for that specific job.
Check filesize of the "duplicatet job", if its different, than anything is fine.