If you have experienced problems with slow or no printing at all, its an easy fix. Here are the two most common problems...
#1 - You need to switch your drivers from a Postscript/Foomatic driver to a CUPS/Gutenprint driver. You can also try a PCL driver if its not installed automatically.
#2 - You can also go into your printer settings and select a lower DPI, possibly to a draft mode.
#1 - To change your drivers to CUPS or PCL, go to "System > Administration > Printing" and then right click your printer giving you problems. Click the "change" button to the right of Make and Model. It will then ask to change drivers. Now pick your printer brand (should already be selected) click forward, and then the model should be selected already also. To the right of the models list are the drivers. Here is where you want to select something different than the Postscript driver. That should do it!
#2 - to change the quality, again go to "System > Admin > Printing" and right click the printer you want to change the settings on. Click Properties. Click Printer Options in the list on the left and then look for Print Quality. My laser printer is set to normal, but you can also change this to "draft -economy" mode or "best" mode.