HP Deskjet 3820 Color Inkjet Printer - Manual (Page 79)

print cartridges are not aligned
If the print cartridges are not aligned, the printer may operate more slowly. To fix this
problem, align the print cartridges .
printer driver is outdated
An outdated printer driver may be installed.
For information about updating the printer driver, click here .
computer does not meet system requirements
1. Verify that the computer's hard disk space, RAM, and processor speed meet
system requirements.
For more information, see system requirements .
2. Increase free space on the hard drive.
If your computer does not have enough RAM, or a large amount of free space
on the hard drive, the printer processing time will be longer.