HP Color Inkjet cp1160 Printer series - Manual (Page 151)

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automatic paper type option is enabled
When the automatic option is enabled, it takes a few seconds for the printer
to scan the first page of the print job to determine the appropriate paper type.
To increase the print speed, turn off the Automatic Paper-Type Sensor.
For instructions on turning off the Automatic Paper-Type Sensor, see turning
off the automatic paper-type sensor .
two-sided documents are printing
Print two-sided documents takes more time than printing single-sided
documents.
printer software is outdated
An outdated driver may be installed.
Log onto HP’s Website to download the most recent software updates for the
printer.
For information about HP’s Website, see hp e-support .